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Note 4 - Share Repurchase Program (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 8 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2019
Nov. 01, 2018
Treasury Stock, Shares, Acquired 0 267,300 372,974  
Treasury Stock, Value, Acquired, Cost Method   $ 1,957 $ 2,699  
Maximum [Member]        
Stock Repurchase Program, Number of Shares Authorized to be Repurchased       2,500,000