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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Employee Pension Plan [Member]        
Interest cost $ 216 $ 226 $ 432 $ 452
Amortization of unrecognized loss 174 201 348 402
Expected return on plan assets (348) (348) (696) (696)
Net expense 42 79 84 158
Directors' Plan [Member]        
Interest cost 23 24 46 48
Amortization of unrecognized loss (23) (21) (46) (42)
Amortization of past service liability 10 10 20 20
Net expense 20 24 40 48
Service cost 10 11 20 22
Other Postretirement Benefit Plans [Member]        
Interest cost 76 80 152 160
Amortization of unrecognized loss 12 24
Amortization of past service liability (21) (22) (42) (43)
Net expense 134 160 268 321
Service cost $ 79 $ 90 $ 158 $ 180