Note 3 - Change in Accounting Policy - Cumulative Effect of Changes for Adoption of New Accounting Standard (Details) - USD ($)	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Paid in capital		$ 6,333,135
Retained earnings	$ 8,236,345	8,701,942	[1]
Selling, general and administrative expenses	6,146,650	6,543,566	[2]
Income from operations	(484,042)	276,308	[2]
Net (loss) income	$ (465,597)	$ 305,989	[2],[3],[4]
Basic (in dollars per share)	$ (0.06)	$ 0.04	[2],[4]
Diluted (in dollars per share)	$ (0.06)	$ 0.04	[2],[4]
Stock-based compensation expense	$ 549,594	$ 515,681	[3]
Previously Reported [Member] | Accounting Standards Update 2016-09 [Member]
Paid in capital		6,186,393
Retained earnings		8,848,684
Selling, general and administrative expenses		6,415,441
Income from operations		404,433
Net (loss) income		$ 434,114
Basic (in dollars per share)		$ 0.06
Diluted (in dollars per share)		$ 0.06
Stock-based compensation expense		$ 387,556
Revision of Prior Period, Adjustment [Member] | Accounting Standards Update 2016-09 [Member]
Paid in capital		146,742
Retained earnings		(146,742)
Selling, general and administrative expenses		128,125
Income from operations		(128,125)
Net (loss) income		$ (128,125)
Basic (in dollars per share)		$ (0.02)
Diluted (in dollars per share)		$ (0.02)
Stock-based compensation expense		$ 128,125

[1] Excludes approximately 2,786,225 and 2,523,513 stock options for the years ended June 30, 2020 and 2019, respectively, as the impact of such awards was anti-dilutive.

[2] As adjusted for change in accounting policy (Note 3)

[3] As adjusted for change in accounting policy (Note 3)

[4] As adjusted for change in accounting policy (Note 3)