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Note 12 - Pension and Other Postretirement Benefit Plans - Change in Benefit Obligation and Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Retirement Plan [Member]      
Projected benefit obligation at beginning of year $ 23,605 $ 22,769  
Interest cost 781 864 $ 902
Actuarial (gain) loss (2,389) 962  
Benefits paid (1,653) (990)  
Projected benefit obligation at end of year 20,344 23,605 22,769
Market value of assets at beginning of year 22,702 20,146  
Actual return on plan assets 1,370 3,546  
Benefits paid (1,653) (990)  
Market value of plan assets at end of year 22,419 22,702 20,146
Accrued pension asset/liability included in other assets 2,075    
Accrued pension cost included in other liabilities   (903)  
Other Postretirement Benefits Plan [Member]      
Projected benefit obligation at beginning of year 9,104 7,978  
Service cost 350 316 359
Interest cost 307 305 320
Actuarial (gain) loss (1,155) 588  
Benefits paid (88) (83)  
Projected benefit obligation at end of year 8,518 9,104 7,978
Market value of assets at beginning of year 0 0  
Benefits paid (88) (83)  
Market value of plan assets at end of year 0 0 0
Employer contributions 88 83  
Accrued pension cost included in other liabilities (8,518) (9,104)  
Directors' Plan [Member]      
Projected benefit obligation at beginning of year 2,425 2,462  
Service cost 42 42 42
Interest cost 78 89 97
Actuarial (gain) loss (184) (24)  
Benefits paid (96) (144)  
Projected benefit obligation at end of year 2,265 2,425 2,462
Market value of assets at beginning of year 0 0  
Benefits paid (96) (144)  
Market value of plan assets at end of year 0 0 $ 0
Employer contributions 96 144  
Accrued pension cost included in other liabilities $ (2,265) $ (2,425)