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Note 9 - Pension and Other Postretirement Benefit Plans - Components of Net Expense for Pension, Outside, and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Employee Pension Plan [Member]    
Interest cost $ 195 $ 216
Amortization of unrecognized loss 155 174
Expected return on plan assets (363) (348)
Net employee pension ( benefit) expense (13) 42
Directors' Plan [Member]    
Interest cost 20 23
Amortization of unrecognized loss (23) (23)
Net employee pension ( benefit) expense 11 20
Service cost 11 10
Amortization of past service liability 3 10
Other Postretirement Benefit Plans [Member]    
Interest cost 77 76
Amortization of unrecognized loss
Net employee pension ( benefit) expense 152 134
Service cost 88 79
Amortization of past service liability $ (13) $ (21)