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Note 10 - Stock-based Compensation Plans - Stock Options Outstanding and Exercisable (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Lower Range of Exercise Price (in dollars per share)	$ 3.5
Upper Range of Exercise Price (in dollars per share)	$ 39.11
Number Outstanding (in shares)	59,000	59,000	59,000
Outstanding Weighted Average Contractual Life Remaining (Year)	4 years 7 months 6 days
Outstanding Weighted Average Exercise Price (in dollars per share)	$ 17.35
Outstanding Aggregate Intrinsic Value	$ 179,290
Options Outstanding Exercise Price Range1 [Member]
Lower Range of Exercise Price (in dollars per share)	$ 3.5
Upper Range of Exercise Price (in dollars per share)	$ 3.86
Number Outstanding (in shares)	13,000
Outstanding Weighted Average Contractual Life Remaining (Year)	3 years 2 months 12 days
Outstanding Weighted Average Exercise Price (in dollars per share)	$ 3.75
Outstanding Aggregate Intrinsic Value	$ 131,050
Options Outstanding Exercise Price Range2 [Member]
Lower Range of Exercise Price (in dollars per share)	$ 7.8
Number Outstanding (in shares)	8,000
Outstanding Weighted Average Contractual Life Remaining (Year)	4 years 4 months 24 days
Outstanding Weighted Average Exercise Price (in dollars per share)	$ 7.8
Outstanding Aggregate Intrinsic Value	$ 48,240
Options Outstanding Exercise Price Range 3 [Member]
Lower Range of Exercise Price (in dollars per share)	$ 19.99
Number Outstanding (in shares)	30,000
Outstanding Weighted Average Contractual Life Remaining (Year)	5 years 1 month 6 days
Outstanding Weighted Average Exercise Price (in dollars per share)	$ 19.99
Options Outstanding Exercise Price Range 4 [Member]
Lower Range of Exercise Price (in dollars per share)	$ 39.11
Number Outstanding (in shares)	8,000
Outstanding Weighted Average Contractual Life Remaining (Year)	5 years 4 months 24 days
Outstanding Weighted Average Exercise Price (in dollars per share)	$ 39.11

X

- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

+ References

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Publisher FASB
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Number of options outstanding, including both vested and non-vested options.

+ References

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-Topic 718
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-Name Accounting Standards Codification
-Section 50
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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

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-Section 50
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X

- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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- Definition

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

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