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Note 9 - Share-Based Compensation (Details Textual)
9 Months Ended
Mar. 31, 2016
shares
President and CEO [Member] | Minimum [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Each Year 0
President and CEO [Member] | Maximum [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Each Year 81,250
Share-based Compensation Arrangement by Share-based Payment Award, Options, Contractual Term 10 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 1,332,557