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Note 9 - Subsequent Events (Details Textual) - USD ($)		6 Months Ended
	Jul. 08, 2020	Jun. 30, 2020	Jun. 30, 2019	May 21, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)		(0)
Shares Issued, Price Per Share (in dollars per share)				$ 5.00
Proceeds from Stock Options Exercised		$ 0	$ 133,200
Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)	3,100
Shares Issued, Price Per Share (in dollars per share)	$ 2.96
Proceeds from Stock Options Exercised	$ 9,176

X

- Definition

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

+ References

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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- Definition

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+ References

No definition available.

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