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Note 10 - Stockholders' Equity and Stock Incentive Plans - Stock Options Outstanding Exercisable (Details)	12 Months Ended
	Dec. 31, 2021 $ / shares shares
Options outstanding, number outstanding (in shares) | shares	274,332
Options outstanding, weighted average remaining contractual life (Year)	4 years
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 17.02
Options exercisable, number exercisable (in shares) | shares	274,332
Options exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 17.02
Range Four [Member]
Options outstanding, number outstanding (in shares) | shares	32,000
Options outstanding, weighted average remaining contractual life (Year)	1 year 10 months 24 days
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 9.86
Options exercisable, number exercisable (in shares) | shares	32,000
Options exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 9.86
Range Five [Member]
Options outstanding, number outstanding (in shares) | shares	23,431
Options outstanding, weighted average remaining contractual life (Year)	2 years 10 months 24 days
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 11.57
Options exercisable, number exercisable (in shares) | shares	23,431
Options exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 11.57
Range Six [Member]
Options outstanding, number outstanding (in shares) | shares	130,383
Options outstanding, weighted average remaining contractual life (Year)	4 years 10 months 24 days
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 17.75
Options exercisable, number exercisable (in shares) | shares	130,383
Options exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 17.75
Range 7 [Member]
Options outstanding, number outstanding (in shares) | shares	88,518
Options outstanding, weighted average remaining contractual life (Year)	3 years 10 months 24 days
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 19.98
Options exercisable, number exercisable (in shares) | shares	88,518
Options exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 19.98

X

- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(iii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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X

- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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X

- Definition

Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(1)
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