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Note 12 - Pension and Other Postretirement Benefit Plans (Details) - Components of the Net Pension Expense for the Directors’ Plan - Directors' 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) - Components of the Net Pension Expense for the Directors’ Plan [Line Items]      
Service cost $ 45 $ 54 $ 82
Interest cost 95 116 98
Amortization of unrecognized gain (56) (60) (36)
Amortization of past service liability 40 40 40
Net pension expense 124 150 184
Current actuarial gain (130) (52) (122)
Amortization of actuarial gain 56 60 36
Amortization of prior service cost (40) (40) (40)
Total recognized in other comprehensive income (114) (32) (126)
Total recognized in net pension expense and other comprehensive income $ 10 $ 118 $ 58