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Note 17 - Stock-based Compensation - Stock Options Activities, by Exercise Price Range (Details)	12 Months Ended
	Dec. 31, 2023 $ / shares shares
Number outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 9.13
Number outstanding (in shares) | shares	34,000
Number outstanding, weighted average remaining contractual life (Year)	2 years 5 months 15 days
Number exercisable (in shares) | shares	34,000
Number exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 9.13
Price Range 1 [Member]
Number outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 12.07
Number outstanding (in shares) | shares	10,000
Number outstanding, weighted average remaining contractual life (Year)	8 months 15 days
Number exercisable (in shares) | shares	10,000
Number exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 12.07
Price Range 2 [Member]
Number outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 11.56
Number outstanding (in shares) | shares	4,000
Number outstanding, weighted average remaining contractual life (Year)	1 year 21 days
Number exercisable (in shares) | shares	4,000
Number exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 11.56
Price Range3 [Member]
Number outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 7.18
Number outstanding (in shares) | shares	20,000
Number outstanding, weighted average remaining contractual life (Year)	3 years 7 months 9 days
Number exercisable (in shares) | shares	20,000
Number exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 7.18

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
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(iii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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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
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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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
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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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
-Topic 718
-SubTopic 10
-Subparagraph (e)(1)
-Name Accounting Standards Codification
-Paragraph 2
-Section 50
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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