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Note 12 - Pension and Other Postretirement Benefit Plans (Details) - The Components of the Net Pension Expense for the Retirement Plan - Retirement Plan [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Note 12 - Pension and Other Postretirement Benefit Plans (Details) - The Components of the Net Pension Expense for the Retirement Plan [Line Items]      
Interest cost $ 889 $ 891 $ 827
Amortization of unrecognized loss 1,112 759 1,222
Expected return on plan assets (1,400) (1,344) (1,261)
Net pension expense (benefit) 601 306 788
Current year actuarial (gain) loss (237) 4,798 (4,722)
Amortization of actuarial loss (1,112) (759) (1,222)
Total recognized in other comprehensive income (1,349) 4,039 (5,944)
Total recognized in net pension cost (benefit) and other comprehensive income $ (748) $ 4,345 $ (5,156)