Note 6 - Stockholders' Equity - Summary of Activity for Restricted Stock (Details) - Restricted Stock [Member] - shares	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Equity awards outstanding, beginning of year (in shares)	11,843,586	9,639,068
Granted (in shares)	2,547,179	3,304,468
Exercised or vested (in shares)	(1,431,666)	(1,379,543)
Expired or Forfeited (in shares)	(20,052)	(165,514)
Equity awards outstanding, end of period (in shares)	12,939,047	11,398,479

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(ii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

+ Details

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