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Note 8 - Stockholders' Equity and Stock Incentive Plans - Dividends (Details)	9 Months Ended
	Sep. 30, 2023 $ / shares
Dividend Declared February 03, 2022 [Member]
Dividends, record date	Mar. 15, 2022
Dividends, payment date	Apr. 15, 2022
Dividends, amount per share (in dollars per share)	$ 0.15
Dividend Declared June 01, 2022 [Member]
Dividends, record date	Jun. 30, 2022
Dividends, payment date	Jul. 15, 2022
Dividends, amount per share (in dollars per share)	$ 0.15
Dividend Declared September 15, 2022 [Member]
Dividends, record date	Sep. 30, 2022
Dividends, payment date	Oct. 15, 2022
Dividends, amount per share (in dollars per share)	$ 0.15
Dividends Declared December 8, 2022 [Member]
Dividends, record date	Dec. 19, 2022
Dividends, payment date	Jan. 15, 2023
Dividends, amount per share (in dollars per share)	$ 0.15
Dividend Declared February 14, 2023 [Member]
Dividends, record date	Mar. 15, 2023
Dividends, payment date	Apr. 15, 2023
Dividends, amount per share (in dollars per share)	$ 0.16
Dividends Declared May 4, 2023 [Member]
Dividends, record date	Jun. 15, 2023
Dividends, payment date	Jul. 15, 2023
Dividends, amount per share (in dollars per share)	$ 0.16
Dividends Declared August 15, 2023 [Member]
Dividends, record date	Sep. 15, 2023
Dividends, payment date	Oct. 15, 2023
Dividends, amount per share (in dollars per share)	$ 0.16

X

- Definition

Date the declared dividend will be paid, in YYYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482913/230-10-50-3

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X

- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482913/230-10-50-3

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X

- Definition

Date the holder must own the stock to be entitled to the dividend, in YYYY-MM-DD format.

+ References

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