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Note 4 - Stock-based Compensation (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share-based Payment Arrangement, Expense   $ 730,000 $ 781,000 $ 1,400,000 $ 1,500,000
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount   $ 4,300,000 $ 5,500,000 $ 4,300,000 $ 5,500,000
2006 Employee Equity Compensation Restricted Stock Plan (the "Employee Plan") [Member] | Restricted Stock [Member]          
Stock Issued During Period, Shares, Restricted Stock Award, Gross       972,175  
2016 Employee Equity Compensation Restricted Stock Plan [Member] | Restricted Stock [Member]          
Stock Issued During Period, Shares, Restricted Stock Award, Gross 77,125     162,158  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 15.98        
2016 Employee Equity Compensation Restricted Stock Plan [Member] | Restricted Stock [Member] | Chief Executive Officer [Member]          
Stock Issued During Period, Shares, Restricted Stock Award, Gross 40,000        
2006 Outside Director Equity Compensation Restricted Stock Plan (the "Director Plan") [Member] | Restricted Stock [Member]          
Stock Issued During Period, Shares, Restricted Stock Award, Gross       272,000  
2015 Outside Director Equity Compensation Restricted Stock Plan ("2015 Director Plan") [Member] | Restricted Stock [Member]          
Stock Issued During Period, Shares, Restricted Stock Award, Gross 37,500     135,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 15.98        
Employee and Director Plans [Member] | Restricted Stock [Member]          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition       3 years 3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance   191,000 191,000 191,000 191,000