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Note 16 - Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Beginning balance $ 269,626 $ 248,158 $ 218,590
Other comprehensive loss, net of tax 184 (52) (43)
Ending balance 283,383 269,626 248,158
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]      
Beginning balance (1,795)    
Other comprehensive income (loss) before reclassifications 386    
Amounts reclassified from Accumulated other comprehensive loss (78)    
Other comprehensive loss, net of tax 308    
Ending balance (1,487) (1,795)  
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]      
Beginning balance (71)    
Other comprehensive income (loss) before reclassifications (178)    
Amounts reclassified from Accumulated other comprehensive loss 54    
Other comprehensive loss, net of tax (124)    
Ending balance (195) (71)  
AOCI Attributable to Parent [Member]      
Beginning balance (1,866) (1,814) (1,536)
Other comprehensive income (loss) before reclassifications 208    
Amounts reclassified from Accumulated other comprehensive loss (24)    
Other comprehensive loss, net of tax 184    
Ending balance $ (1,682) $ (1,866) $ (1,814)