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Note 6 - Stock Based Compensation - Summary of Activity for Stock Options (Details) - shares	6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025
Stock options outstanding, beginning of year (in shares)	4,204,816	4,470,216
Granted (in shares)	0	0
Exercised (in shares)	(144,660)	(51,650)
Expired or Forfeited (in shares)	0	(56,250)
Stock options outstanding, end of period (in shares)	4,060,156	4,362,316

X

- Definition

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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X

- Definition

Gross number of share options (or share units) granted during the period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section S45
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X

- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

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-Name Accounting Standards Codification
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X

- Definition

Number of share options (or share units) exercised during the current period.

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