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Note 3 - Stock-based Compensation (Details Textual) - USD ($)
shares in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares, Ending Balance 0 0 0 0    
Allocated Share-based Compensation Expense, Total $ 91,000 $ 45,000 $ 136,000 $ 90,000    
Restricted Stock [Member]            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options $ 141,000   $ 141,000      
Restricted Stock [Member] | Scenario, Forecast [Member]            
Allocated Share-based Compensation Expense, Total         $ 71,000 $ 70,000