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Note 18 - Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Beginning balance $ 218,590 $ 200,264 $ 209,213
Other comprehensive income (loss), net of tax (43) (91) 38
Ending balance 248,158 218,590 200,264
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]      
Beginning balance (1,551)    
Cumulative-effect adjustment for ASU 2018-02 (Note 2) (235)    
Other comprehensive loss before reclassifications (6)    
Amounts reclassified from Accumulated other comprehensive loss 22    
Other comprehensive income (loss), net of tax 16    
Ending balance (1,770) (1,551)  
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]      
Beginning balance 15    
Cumulative-effect adjustment for ASU 2018-02 (Note 2)    
Other comprehensive loss before reclassifications (52)    
Amounts reclassified from Accumulated other comprehensive loss (7)    
Other comprehensive income (loss), net of tax (59)    
Ending balance (44) 15  
AOCI Attributable to Parent [Member]      
Beginning balance (1,536) (1,445) (1,483)
Cumulative-effect adjustment for ASU 2018-02 (Note 2) (235)    
Other comprehensive loss before reclassifications (58)    
Amounts reclassified from Accumulated other comprehensive loss 15    
Other comprehensive income (loss), net of tax (43)    
Ending balance $ (1,814) $ (1,536) $ (1,445)