Quarterly report pursuant to Section 13 or 15(d)

Transactions Affecting Stockholders' Equity (Details Textual)

v2.4.1.9
Transactions Affecting Stockholders' Equity (Details Textual) (USD $)
3 Months Ended 1 Months Ended 7 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Nov. 21, 2012
May 28, 2014
Dec. 31, 2014
Stockholders' Equity [Line Items]          
Equity Method Investment Ownership Percentage Required For Rights Exercisable Under Right Agreement 15.00%prph_EquityMethodInvestmentOwnershipPercentageRequiredForRightsExercisableUnderRightAgreement        
Common Stock, Shares, Issued 25,125,113us-gaap_CommonStockSharesIssued       25,125,113us-gaap_CommonStockSharesIssued
Proceeds From Issuance Of Common Stock $ 0us-gaap_ProceedsFromIssuanceOfCommonStock $ 947,000us-gaap_ProceedsFromIssuanceOfCommonStock      
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 45us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1        
Cash Less Exercise Of Right Terms In the event of a cashless exercise of the Right and the acquirer has acquired less than 50% beneficial ownership of the Company        
Share Based Compensation Arrangement By Share Based Payment Option Expiration Terms No incentive stock option could be exercisable more than ten years after the date of grant or five years after the date of grant where the individual owns more than ten percent of the total combined voting power of all classes of stock. Stockholders approved the 1997 Plan in Fiscal 1998        
Percentage Of Discount On Exercise Of Right 50.00%prph_PercentageOfDiscountOnExerciseOfRight        
2012 Equity Line of Credit [Member]          
Stockholders' Equity [Line Items]          
Maximum Number Of Common Stock Authorized For Issuance Over 36 Months     2,500,000prph_MaximumNumberOfCommonStockAuthorizedForIssuanceOver36Months
/ us-gaap_ShortTermDebtTypeAxis
= prph_TwoThousandTwelveEquityLineOfCreditMember
   
2014 Equity Line of Credit [Member]          
Stockholders' Equity [Line Items]          
Maximum Number Of Common Stock Authorized For Issuance Over 36 Months       3,000,000prph_MaximumNumberOfCommonStockAuthorizedForIssuanceOver36Months
/ us-gaap_ShortTermDebtTypeAxis
= prph_TwoThousandFourteenEquityLineOfCreditMember
 
Investor Right To Use Excess Proceeds, Maximum Percentage 5.00%prph_InvestorRightToUseExcessProceedsMaximumPercentage
/ us-gaap_ShortTermDebtTypeAxis
= prph_TwoThousandFourteenEquityLineOfCreditMember
       
Share Purchase Put Restrictions Maximum Percentage Of Ownership Held By Investor To Purchase Shares In Equity Line Of Credit 4.99%prph_SharePurchasePutRestrictionsMaximumPercentageOfOwnershipHeldByInvestorToPurchaseSharesInEquityLineOfCredit
/ us-gaap_ShortTermDebtTypeAxis
= prph_TwoThousandFourteenEquityLineOfCreditMember
       
Common Stock, Capital Shares Reserved for Future Issuance 438,480us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_ShortTermDebtTypeAxis
= prph_TwoThousandFourteenEquityLineOfCreditMember
    3,000,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_ShortTermDebtTypeAxis
= prph_TwoThousandFourteenEquityLineOfCreditMember
 
Equity Line, Purchase Price Percentage 95.00%prph_EquityLinePurchasePricePercentage
/ us-gaap_ShortTermDebtTypeAxis
= prph_TwoThousandFourteenEquityLineOfCreditMember
       
Common Stock, Shares, Issued         2,561,520us-gaap_CommonStockSharesIssued
/ us-gaap_ShortTermDebtTypeAxis
= prph_TwoThousandFourteenEquityLineOfCreditMember
Proceeds From Issuance Of Common Stock         3,700,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_ShortTermDebtTypeAxis
= prph_TwoThousandFourteenEquityLineOfCreditMember
Agreement Term       36 months  
Purchase Price Value 500,000prph_PurchasePriceValue
/ us-gaap_ShortTermDebtTypeAxis
= prph_TwoThousandFourteenEquityLineOfCreditMember
       
Common Stock, Capital Shares Reserved For Future Issuance 438,480us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_ShortTermDebtTypeAxis
= prph_TwoThousandFourteenEquityLineOfCreditMember
    3,000,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_ShortTermDebtTypeAxis
= prph_TwoThousandFourteenEquityLineOfCreditMember
 
Ted Karkus [Member]          
Stockholders' Equity [Line Items]          
Equity Method Investment, Ownership Percentage 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
       
Plan 1997 [Member]          
Stockholders' Equity [Line Items]          
Options outstanding - Shares 26,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= prph_Plan1997Member
       
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Common Stock Shares Unissued 2,500,000prph_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodCommonStockSharesUnissued
/ us-gaap_PlanNameAxis
= prph_Plan1997Member
       
Available for grant, Shares (in shares) 900,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= prph_Plan1997Member
       
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period 1,481,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
/ us-gaap_PlanNameAxis
= prph_Plan1997Member
       
Plan 2010 [Member]          
Stockholders' Equity [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 1,600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= prph_Plan2010Member
       
Share Based Compensation Arrangement By Share Based Payment Award, Options, Deemed Cancelled 581,750prph_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsDeemedCancelled
/ us-gaap_PlanNameAxis
= prph_Plan2010Member
       
Available for grant, Shares (in shares) 19,659us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= prph_Plan2010Member
       
Directors Plan 2010 [Member]          
Stockholders' Equity [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 425,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= prph_DirectorsPlan2010Member
       
Available for grant, Shares (in shares) 147,808us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= prph_DirectorsPlan2010Member
       
Amended Option Plan 1997 [Member]          
Stockholders' Equity [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 4,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_PlanNameAxis
= prph_AmendedOptionPlan1997Member
       
Common Stock [Member] | Dutchess [Member] | 2012 Equity Line of Credit [Member]          
Stockholders' Equity [Line Items]          
Stock Issued During Period Shares Under Specific Agreement 698,207prph_StockIssuedDuringPeriodSharesUnderSpecificAgreement
/ dei_LegalEntityAxis
= prph_DutchessMember
/ us-gaap_ShortTermDebtTypeAxis
= prph_TwoThousandTwelveEquityLineOfCreditMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Stock Issued During Period Value Specific Agreement $ 1,200,000prph_StockIssuedDuringPeriodValueSpecificAgreement
/ dei_LegalEntityAxis
= prph_DutchessMember
/ us-gaap_ShortTermDebtTypeAxis
= prph_TwoThousandTwelveEquityLineOfCreditMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember