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Note 16 - Equity Based Compensation (Details) - Fair Value of Stock Option Award Granted (USD $)
12 Months Ended
Dec. 31, 2014
Fair Value of Stock Option Award Granted [Abstract]  
Option exercise price, per share (in Dollars per share) $ 15.97us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
Fair value of stock option awards granted, per share (in Dollars per share) $ 5.73plmt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityAwardGrantDateFairValue
Expected dividend yield 1.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
Expected volatility 36.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
Risk-free interest rate 2.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
Expected term (years) 7 years
Vesting period (years) 5 years