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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, 2017
Dec. 31, 2016
Dec. 31, 2015
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       100,000 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      
Employee Stock Option [Member]          
Earnings Per Share and Share Repurchase Plan [Line Items]          
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 25,000 23,500 21,000