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Note 8 - Equity Transactions and Stock-based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended		9 Months Ended
	May 06, 2022	Nov. 30, 2021	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)					$ 0.97
Share-Based Payment Arrangement, Expense			$ 49	$ 94	$ 290	$ 162
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total			$ 616		$ 616
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)					3 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)					29,667
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share)					$ 0.25
Subsequent Event [Member] \| Executive Chairman and President [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)	100,000
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share)	$ 0.23
Share-Based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)		564,700
Share-Based Payment Arrangement, Option [Member] \| Minimum [Member]
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)		$ 0.95
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		1 year
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)		5 years
Share-Based Payment Arrangement, Option [Member] \| Maximum [Member]
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)		$ 1.045
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		3 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)		10 years