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Note G - Note Receivable (Details Textual) - USD ($)	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2020
Financing Receivable, after Allowance for Credit Loss, Current, Total		$ 82,000	$ 295,000	$ 295,000
Receivable with Imputed Interest, Effective Yield (Interest Rate)	5.00%
Accounts Receivable, Allowance for Credit Loss, Ending Balance		$ 100,000

X

- Definition

Amount of allowance for credit loss on accounts receivable.

+ References

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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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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.

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