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Note 3 - Trading Account Assets (Details) - Trading Accounts Credit Ratings (Trading, Municipal Bonds [Member], Credit Concentration Risk [Member])
 3 Months Ended
Mar. 31, 2015
Financing Receivable, Recorded Investment [Line Items]  
Trading accounts credit ratings 100.00%us-gaap_ConcentrationRiskPercentage1
Standard & Poor's, AAA Rating [Member]  
Financing Receivable, Recorded Investment [Line Items]  
Trading accounts credit ratings 12.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= plmt_TradingMunicipalBondsMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsAAARatingMember
Standard and Poor's AA+ - AA- [Member]  
Financing Receivable, Recorded Investment [Line Items]  
Trading accounts credit ratings 61.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= plmt_TradingMunicipalBondsMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_CreditRatingStandardPoorsAxis
= plmt_StandardAndPoorsAAPlusToAAMinusMember
Standard and Poor's A+ - A- [Member]  
Financing Receivable, Recorded Investment [Line Items]  
Trading accounts credit ratings 14.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= plmt_TradingMunicipalBondsMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_CreditRatingStandardPoorsAxis
= plmt_StandardAndPoorsAPlusToAMinusMember
Not Rated [Member]  
Financing Receivable, Recorded Investment [Line Items]  
Trading accounts credit ratings 13.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= plmt_TradingMunicipalBondsMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_CreditRatingStandardPoorsAxis
= plmt_NotRatedMember
Moody's, Aaa Rating [Member]  
Financing Receivable, Recorded Investment [Line Items]  
Trading accounts credit ratings 11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= plmt_TradingMunicipalBondsMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_CreditRatingMoodysAxis
= us-gaap_MoodysAaaRatingMember
Moody's Aa1 - Aa3 [Member]  
Financing Receivable, Recorded Investment [Line Items]  
Trading accounts credit ratings 52.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= plmt_TradingMunicipalBondsMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_CreditRatingMoodysAxis
= plmt_MoodysAa1ToAa3Member
Moody's A1 - A3 [Member]  
Financing Receivable, Recorded Investment [Line Items]  
Trading accounts credit ratings 20.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= plmt_TradingMunicipalBondsMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_CreditRatingMoodysAxis
= plmt_MoodysA1ToA3Member
Not Rated [Member]  
Financing Receivable, Recorded Investment [Line Items]  
Trading accounts credit ratings 17.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= plmt_TradingMunicipalBondsMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_CreditRatingMoodysAxis
= plmt_NotRatedMember