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Note 2 - Earnings Per Share and Share Repurchase Plan (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Feb. 09, 2009
Jan. 24, 2008
Earnings Per Share and Share Repurchase Plan [Line Items]          
Treasury stock, shares 164,569 164,569      
Treasury stock, value $ 2,476 $ 2,476      
Share Repurchase Program 1 [Member]          
Earnings Per Share and Share Repurchase Plan [Line Items]          
Stock repurchase program, number of shares authorized to be repurchased         50,000
Treasury stock, shares, acquired 0 0      
Treasury stock, shares 57,883 57,883      
Treasury stock shares average price per share acquired $ 16.97 $ 16.97      
Treasury stock, value $ 982 $ 982      
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       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 73,000 25,000 25,000