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Note 14 - Stockholders' Equity - Stockholders' Equity Transactions (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Balances $ 115,092  
Exercise of stock options (in shares) 11,592 28,337
Exercise of stock options $ 515  
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration 0  
Stock-based compensation 1,391  
Net income (3,020) $ 2,149
Other comprehensive income (loss) 1,034 $ (466)
Balances $ 115,012  
Common Stock [Member]    
Balances (in shares) 10,747,417  
Balances $ 28,515  
Exercise of stock options (in shares) 11,592  
Exercise of stock options $ 757  
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration (in shares) (1,860)  
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration $ 0  
Stock-based compensation 383  
Other comprehensive income (loss) $ 0  
Balances (in shares) 10,762,581  
Balances $ 29,655  
Additional Paid-in Capital [Member]    
Balances 2,764  
Exercise of stock options (242)  
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration 0  
Stock-based compensation 1,008  
Other comprehensive income (loss) 0  
Balances 3,530  
Retained Earnings [Member]    
Balances 83,470  
Exercise of stock options 0  
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration 0  
Stock-based compensation 0  
Net income (3,020)  
Other comprehensive income (loss) 0  
Balances 80,450  
AOCI Attributable to Parent [Member]    
Balances 343  
Exercise of stock options 0  
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration 0  
Stock-based compensation 0  
Other comprehensive income (loss) 1,034  
Balances $ 1,377