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Note 4 - Earnings Per Share & Share Repurchase Plan (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Apr. 29, 2021
Feb. 09, 2009
Earnings Per Share and Share Repurchase Plan [Line Items]              
Treasury stock, shares 208,686   208,686   206,686    
Treasury stock, value   $ 346 $ 75 $ 633      
Board of Directors [Member]              
Earnings Per Share and Share Repurchase Plan [Line Items]              
Stock repurchase plan approved date     Jan. 21, 2008        
Share Repurchase Program 1 [Member]              
Earnings Per Share and Share Repurchase Plan [Line Items]              
Treasury stock, shares, acquired     2,000 18,391      
Treasury stock, shares 102,000   102,000        
Treasury stock shares average price per share acquired     $ 24.93        
Treasury stock, value     $ 2,543        
Share Repurchase Program 1 [Member] | Maximum [Member]              
Earnings Per Share and Share Repurchase Plan [Line Items]              
Stock repurchase program, number of shares authorized to be repurchased           200,000 100,000
Employee Stock Option [Member]              
Earnings Per Share and Share Repurchase Plan [Line Items]              
Antidilutive securities excluded from computation of earnings per share, amount 121,225 94,400 97,225 119,400