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Note 9 - Post-retirement Benefits (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]    
Retirement Plan Minimum Age 65ins_RetirementPlanMinimumAge  
Retirement Plan Lump Sum Cash Payment Per Year $ 5,000ins_RetirementPlanLumpSumCashPaymentPerYear  
Retirement Plan Lump Sum Cash Payment, Maximum 50,000ins_RetirementPlanLumpSumCashPaymentMaximum  
Retirement Plan Lump Sum Cash Payment, Accrual $ 125,000ins_RetirementPlanLumpSumCashPaymentAccrual $ 141,000ins_RetirementPlanLumpSumCashPaymentAccrual