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Note 2 - Earnings Per Share and Share Repurchase Plan (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended 167 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2021
Apr. 27, 2021
Feb. 09, 2009
Jan. 21, 2008
Earnings Per Share and Share Repurchase Plan [Line Items]              
Treasury stock, value $ 1,356 $ 130          
Board of Directors [Member]              
Earnings Per Share and Share Repurchase Plan [Line Items]              
Stock repurchase plan approved date Jan. 21, 2008            
Share Repurchase Program1              
Earnings Per Share and Share Repurchase Plan [Line Items]              
Treasury stock, shares, acquired 38,017 4,100 0 100,000      
Treasury stock shares average price per share acquired       $ 24.69      
Treasury stock, value       $ 2,469      
Share Repurchase Program1 | 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 50,000
Employee Stock Option [Member]              
Earnings Per Share and Share Repurchase Plan [Line Items]              
Antidilutive securities excluded from computation of earnings per share, amount 90,000 96,000 73,000