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Note 12 - Stockholders' Equity (Details Textual)						3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 01, 2020 shares	Oct. 05, 2017	Oct. 02, 2017 shares	May 25, 2016	Jun. 12, 2015 shares	Jun. 30, 2021 USD ($) $ / shares shares	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) $ / shares shares	Jun. 30, 2020 USD ($)	Dec. 31, 2020 $ / shares shares	Mar. 31, 2021 $ / shares	Jun. 13, 2016 shares
Increase (Decrease) in Common Stock Shares Authorized (in shares)			(300,000,000)		100,000,000
Common Stock, Shares Authorized (in shares)			100,000,000		300,000,000	100,000,000		100,000,000		100,000,000		400,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share) | $ / shares						$ 200,648		$ 200,648		$ 200,648
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)						200,648		200,648		200,648
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share) | $ / shares										$ 10.73	$ 10.73
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)								6 years 6 months 29 days		7 years 25 days
Plan 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)	219,500
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)	1,160,500
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)						208,664		208,664		210,500
Plan 2013 [Member] | Board of Directors [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount, Total | $						$ 11,237	$ 7,500	$ 22,494	$ 15,000
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio		10		10

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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