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Note 10 - Stock-based Compensation (Details Textual) - USD ($)		1 Months Ended			3 Months Ended		9 Months Ended
	Nov. 14, 2017	Dec. 31, 2018	Nov. 30, 2018	Nov. 30, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance					0		0
Share-based Payment Arrangement, Expense					$ 724,970	$ 731,995	$ 2,255,937	$ 1,730,112
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance					456,666		456,666
The 2010 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	1,500,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total					$ 3,837,805		$ 3,837,805
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period					0		35,625	190,000
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period							19,513	93,026
Proceeds from Stock Options Exercised							$ 0	$ 0
The 2010 Plan [Member] | Restricted Stock [Member] | Executives and Non-executive Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			155,000	155,000
The 2010 Plan [Member] | Restricted Stock [Member] | Executives and Non-executive Directors [Member] | November 2017 Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance					155,000		155,000
The 2010 Plan [Member] | Restricted Stock [Member] | Executives and Non-executive Directors [Member] | November 2018 Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance					155,000		155,000
The 2010 Plan [Member] | Restricted Stock [Member] | Two Executives and Non-executive Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance					146,666		146,666
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		146,666
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period		117,332

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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