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Note 9 - Fair Value of Financial Instruments (Details Textual) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Warrants and Rights Outstanding	$ 6,344,663	$ 6,639,211
Fair Value, Inputs, Level 1 [Member]
Cash and Cash Equivalents, Fair Value Disclosure	100,000	$ 100,000
Fair Value, Inputs, Level 2 [Member]
Cash and Cash Equivalents, Fair Value Disclosure	0
The 2016 Warrant [Member]
Warrants and Rights Outstanding	$ 6,300,000

X

- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

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X

- Definition

Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

+ References

No definition available.

+ Details

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- Details

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