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Note 16 - Equity Based Compensation (Details) - Compensation Expense (Restricted Stock And Stock Options [Member], USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Compensation expense    
Equity-based Compensation Expense $ 191us-gaap_AllocatedShareBasedCompensationExpense $ 252us-gaap_AllocatedShareBasedCompensationExpense
Income tax benefit 70us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 93us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
2008 Restricted Stock Plan [Member]
    
Compensation expense    
Equity-based Compensation Expense 11us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= plmt_RestrictedStockAndStockOptionsMember
/ us-gaap_PlanNameAxis
= plmt_TwoThousandEightRestrictedStockPlanMember		 31us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= plmt_RestrictedStockAndStockOptionsMember
/ us-gaap_PlanNameAxis
= plmt_TwoThousandEightRestrictedStockPlanMember
2011 Stock Incentive Plan [Member]
    
Compensation expense    
Equity-based Compensation Expense $ 180us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= plmt_RestrictedStockAndStockOptionsMember
/ us-gaap_PlanNameAxis
= plmt_TwoZeroOneOneStockIncentivePlanMember		 $ 221us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= plmt_RestrictedStockAndStockOptionsMember
/ us-gaap_PlanNameAxis
= plmt_TwoZeroOneOneStockIncentivePlanMember