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Note 7 - Stockholders' Equity - Common Stock Purchased (Details) - USD ($)	1 Months Ended		12 Months Ended
	Aug. 31, 2020	Jul. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Total shares purchased (in shares)	22,963	675	23,638
Average price per share (in dollars per share)	$ 6.20	$ 6.21
Publicly Announced Repurchase Plan [Member]
Total shares purchased (in shares)	23,638	675	0	23,638
Average price per share (in dollars per share)				$ 6.20
Value of shares that may be purchased under the plan	$ 1,000,000	$ 1,200,000

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- Definition

Amount of stock repurchase plan authorized.

+ References

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- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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Number of shares that have been repurchased during the period and are being held in treasury.

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-Topic 505
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