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EARNINGS PER SHARE (Details Textual)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Common stock equivalents were in-in-the-money      
Earnings Loss Per Share [Line Items]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 598,609us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= prph_CashEquivalents1Member
  177,035us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= prph_CashEquivalents1Member
Common stock equivalents out-of-the-money      
Earnings Loss Per Share [Line Items]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 26,500us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= prph_CashEquivalents2Member
472,500us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= prph_CashEquivalents2Member
114,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= prph_CashEquivalents2Member