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Note 10 - 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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Employee Pension Plan [Member]        
Net employee pension benefit $ (5) $ (13) $ (18) $ (39)
Employee Pension Plan [Member]        
Interest cost 199 195 597 585
Amortization of unrecognized loss 68 155 201 465
Expected return on plan assets (272) (363) (816) (1,089)
Directors' Plan [Member]        
Interest cost 21 19 63 60
Amortization of unrecognized loss (35) (23) (105) (69)
Net employee pension benefit (4) 10 (12) 33
Service cost 10 11 30 33
Amortization of past service liability 0 3 0 9
Other Postretirement Benefit Plans [Member]        
Interest cost 85 77 255 231
Net employee pension benefit 133 152 401 458
Service cost 70 88 210 264
Amortization of past service liability $ (22) $ (13) $ (64) $ (37)