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Note 14 - Stockholders' Equity - Stockholders' Equity Transactions (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Balances $ 104,698  
Exercise of stock options (in shares) 28,337 25,013
Exercise of stock options $ 229  
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration (218)  
Stock-based compensation 1,022  
Net income 2,149 $ 2,834
Other comprehensive income (loss) (466) $ (1,191)
Balances $ 107,414  
Common Stock [Member]    
Balances (in shares) 10,612,414  
Balances $ 20,798  
Exercise of stock options (in shares) 28,337  
Exercise of stock options $ 713  
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration (in shares) (16,336)  
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration $ 0  
Stock-based compensation 0  
Other comprehensive income (loss) $ 0  
Balances (in shares) 10,624,415  
Balances $ 21,511  
Additional Paid-in Capital [Member]    
Balances 1,458  
Exercise of stock options (484)  
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration (218)  
Stock-based compensation 1,022  
Other comprehensive income (loss) 0  
Balances 1,778  
Retained Earnings [Member]    
Balances 80,106  
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 2,149  
Other comprehensive income (loss) 0  
Balances 82,255  
AOCI Attributable to Parent [Member]    
Balances 2,336  
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) (466)  
Balances $ 1,870