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Note 9 - Equity Compensation (Details Textual)	3 Months Ended	12 Months Ended			75 Months Ended
Note 9 - Equity Compensation (Details Textual)	Jun. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2017	Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		972,900	794,537
Class of Warrant or Right, Outstanding	200,000	200,000
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares	$ 9.95	$ 9.95
Class of Warrant or Right, Remaining Contractual Life		2 years 255 days
Class of Warrant or Right, Exercise Price of Warrants or Rights, Fair value \| $ / shares	$ 2.87	$ 2.87
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price \| $ / shares		4.57	$ 5.98
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value \| $ / shares		$ 1.48	$ 1.73
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term		5 years 219 days	5 years 292 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period		1,406,548	467,609
Share Based Compensation Valuation Assumptions Expected Forfeiture Rate	14.86%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value \| $		$ 0	$ 39,011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Aggregate Grant Date Fair Value \| $		$ 2,287,386	$ 3,192,672
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		0	42,939
Proceeds from Stock Options Exercised \| $			$ 285,875
Reduction of Deferred Tax Asset Related to Stock Option Exercises \| $		$ 282,785	292,000
Reduction of Federal Income Taxes Payable Related To Stock Option Exercise \| $			116,602
Reduction of Income Tax Expense Related to Stock Option Exercises \| $			$ 10,767
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period		104,020	41,388
Shares Issued, Value, Share-based Payment Arrangement, before Forfeiture \| $		$ 374,000	$ 312,000
Deferred Compensation Plan, Number of Participants	32	32
Deferred Compensation Arrangement with Individual, Shares Issued		74,721	67,138
Employee Salary Deferrals or Company Contributions [Member]
Treasury Stock, Value, Acquired, Cost Method \| $			$ 106,537
Treasury Stock, Shares, Acquired			15,225
Deferred Compensation Plan With Rabbit Trust [Member]
Treasury Stock, Shares, Ending Balance	208,965	208,965	241,996
Treasury Stock, Value, Ending Balance \| $	$ 1,468,161	$ 1,468,161	$ 2,110,248
Inducement Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		3 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period		10 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		550,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				4 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value \| $ / shares			$ 5.92
Share Based Compensation Valuation Assumptions Expected Forfeiture Rate		8.30%
Share-based Payment Arrangement, Expense \| $		$ 40,893
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		0	91,490
Dividends, Total \| $		$ 16,848	$ 50,621
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance	33,042	33,042
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms		3 years 182 days
Share-based Compensation Arrangement By Share-based Payment Award, Equity Other Than Options, Vested and Expected To Vest, Outstanding, Number	32,429	32,429
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total \| $	$ 45,683	$ 45,683
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition		1 year 30 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance	33,042	33,042	169,397
Performance-based Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period			345,560
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Expense \| $		$ 876,333	$ 2,147,423
Performance Stock Units [Member]
Share Based Compensation Valuation Assumptions Expected Forfeiture Rate		11.70%
Share-based Payment Arrangement, Expense \| $		$ 62,474
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		134,350	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms		2 years 36 days
Share-based Compensation Arrangement By Share-based Payment Award, Equity Other Than Options, Vested and Expected To Vest, Outstanding, Number	43,451	43,451
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total \| $	$ 152,172	$ 152,172
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition		2 years 30 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value \| $ / shares		$ 4.94
Dividend, Share-based Payment Arrangement, Cash \| $		$ 11,310	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance	56,550	56,550
Minimum [Member]
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price \| $ / shares		$ 3.18	$ 5.92
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value \| $ / shares		$ 0.72	$ 1.71
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term		9 years	9 years
Share Based Compensation Valuation Assumptions Expected Forfeiture Rate					2.00%
Maximum [Member]
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price \| $ / shares		$ 4.94	$ 6.54
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value \| $ / shares		$ 2.10	$ 1.96
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term		10 years	10 years
Share Based Compensation Valuation Assumptions Expected Forfeiture Rate					8.79%
The 2012 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	1,967,217	1,967,217
Share-based Compensation Arrangement by Share-based Payment Award, Fungible Share Ratio		2.5
The 2012 Stock Incentive Plan [Member] \| Minimum [Member] \| Service-based and Performance-based Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		3 years
The 2012 Stock Incentive Plan [Member] \| Minimum [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		3 years
The 2012 Stock Incentive Plan [Member] \| Maximum [Member] \| Service-based and Performance-based Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		4 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period		10 years
The 2012 Stock Incentive Plan [Member] \| Maximum [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		4 years