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Note 4 - Earnings Per Share & Share Repurchase Plan (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Feb. 09, 2009
Earnings Per Share and Share Repurchase Plan [Line Items]        
Treasury stock, shares 164,569   164,569  
Treasury stock, value $ 2,476   $ 2,476  
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 0 0    
Treasury stock, shares 57,883      
Treasury stock shares average price per share acquired $ 16.97      
Treasury stock, value $ 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 98,150 74,150