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Note 12 - Income Taxes - Unrecognized Tax Benefits Roll Forward (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Balance at beginning of year	$ 5,591,587	$ 5,649,188	$ 5,738,964
Additions	11,000	0	0
Reductions	0	(57,601)	(89,776)
Settlements	0	0	0
Lapses in applicable statutes of limitation	0	0	0
Balance at the end of the year	$ 5,602,587	$ 5,591,587	$ 5,649,188

X

- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 10B
-URI http://asc.fasb.org/extlink&oid=123427490&loc=SL37586934-109318

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 15A
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X

- Definition

Amount of decrease in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
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- Definition

Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

+ References

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-Publisher FASB
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-SubTopic 10
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- Definition

Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

+ References

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

+ References

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-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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