Note 8 - Employee Benefit Plans (Details) - Components of Net Periodic Benefit Cost to be Recognized Over Next Fiscal Year - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Note 8 - Employee Benefit Plans (Details) - Components of Net Periodic Benefit Cost to be Recognized Over Next Fiscal Year [Line Items]
Amortization of prior service benefit	$ (337)	$ (337)	$ 66
Amounts Expected to be Recognized in 2015 [Member]
Note 8 - Employee Benefit Plans (Details) - Components of Net Periodic Benefit Cost to be Recognized Over Next Fiscal Year [Line Items]
Amortization of net loss	4,372
Amortization of prior service benefit	$ (337)