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Note 6 - Stock-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
May 08, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 750,000        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   780,747   780,747  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   2,300,000   2,300,000  
Maximum Number of Shares of Class A Common Stock Awarded to any Participant in the Incentive Plan in any Calendar Year   200,000   200,000  
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding, Ending Balance   0 0 0 0
Payment, Tax Withholding, Share-based Payment Arrangement       $ 667 $ 18
Common Class A [Member]          
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation       29,390  
Share-based Compensation Arrangement by Share-based Payment Award, Per Share Weighted Average Price of Shares Purchased   $ 22.71   $ 22.71  
General Supplies and Expenses [Member]          
Share-based Payment Arrangement, Expense   $ 400 $ 400   400
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       400,000  
Share-based Payment Arrangement, Option [Member]          
Share-based Payment Arrangement, Expense   $ (1,800) $ 900 $ (500) $ 1,800