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Note 11 - Equity Incentive Plan - Assumptions Used to Estimate Fair Value of Stock Options and Stock Appreciation Rights (Details)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Expected life (years) (Year)	4 years 6 months	4 years
Expected dividend yield	0.00%	0.00%
Fair value per option	0.1137	0.1390
Expected life of options (in years) (Year)	4 years 6 months	4 years
Expected dividend yield	0.00%	0.00%
Employee Stock Purchase Plan (ESPP) [Member]
Risk free interest rate	0.06%
Expected volatility	32.58%
Expected life (years) (Year)	6 months
Expected dividend yield	0.00%
Risk-free interest rate	0.06%
Expected stock price volatility	32.58%
Expected life of options (in years) (Year)	6 months
Expected dividend yield	0.00%
Minimum [Member]
Risk free interest rate	1.30%	0.30%
Expected volatility	53.80%	54.80%
Risk-free interest rate	1.30%	0.30%
Expected stock price volatility	53.80%	54.80%
Maximum [Member]
Risk free interest rate	1.90%	0.60%
Expected volatility	54.60%	55.40%
Risk-free interest rate	1.90%	0.60%
Expected stock price volatility	54.60%	55.40%

X

- Definition

Represents fair value per option related to share based compensation arrangement by share based payment award.

+ References

No definition available.

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(ii)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iv)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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