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Note 8 - Note Receivable (Details Textual) - USD ($)	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Financing Receivable, after Allowance for Credit Loss, Current, Total	$ 0	$ 295,000	$ 295,000
Receivable with Imputed Interest, Effective Yield (Interest Rate)	5.00%
Allowance for Doubtful Accounts [Member]
Financing Receivable, Reserve Amount	$ 100,000

X

- Definition

Reserve amount of note receivable

+ References

No definition available.

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X

- Definition

Amount, after allowance for credit loss, of financing receivable, classified as current. Includes, but is not limited to, notes and loan receivable.

+ References

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-Publisher FASB
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X

- Definition

Yield on the receivable, on which interest has been imputed, as calculated from its issuance value or purchase price. The calculated effective interest rate considers factors such as the issued face value or price paid for the receivable, the time period between payments, and the time until maturity [full receipt] of the receivable.

+ References

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-Publisher FASB
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