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Note 7 - Common Stock, Treasury Stock and Warrants (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Common Stock, Shares, Issued (in shares)	84,146,082		83,057,083
Treasury Stock, Shares, Total (in shares)	4,300,152		4,091,823
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)	208,329
Treasury Stock, Value, Total	$ 11,171		$ 10,723
Class of Warrant or Right, Outstanding (in shares)		833,333
Minimum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 3.75
Maximum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 6.00
Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)	1,088,999
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)	208,329

X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644

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Number of warrants or rights outstanding.

+ References

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

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-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
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Number of shares issued under share-based payment arrangement.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

+ References

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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