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Note 10 - Equity Compensation (Details Textual)
1 Months Ended 3 Months Ended 12 Months Ended 18 Months Ended
Nov. 30, 2016
shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
$ / shares
shares
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     724,037      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares     $ 5.92      
Allocated Share-based Compensation Expense, Total | $   $ 551,000 $ 984,000      
Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term   10 years        
Service-based Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       3 years 4 years  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   422,900        
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares   $ 4.94        
Restricted Stock Units (RSUs) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         4 years 3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     91,490      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares     $ 5.92      
Performance Shares [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Fungible Share Ratio   2.5        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   134,350        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares   $ 4.94        
Performance Shares [Member] | Share-based Compensation Award, Tranche One [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   33.00%        
The 2012 Stock Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 1,600,000          
Share-based Compensation Arrangement by Share-based Payment Award, Fungible Share Ratio 2.5