Note 7 - Stock Options - Details of Options Outstanding (Details) - shares	3 Months Ended
Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Number of options outstanding (in shares)	1,065,000	1,565,000	5,415,000
Exercisable (in shares)	927,000
Range Four [Member]
Number of options outstanding (in shares)	375,000
Expiry date	Jun. 10, 2024
Exercisable (in shares)	375,000
Remaining contractual life (Year)	2 months 8 days
Range Five [Member]
Number of options outstanding (in shares)	590,000
Expiry date	Oct. 14, 2024
Exercisable (in shares)	472,000
Remaining contractual life (Year)	6 months 14 days
Range Six [Member]
Number of options outstanding (in shares)	100,000
Expiry date	Jan. 31, 2025
Exercisable (in shares)	80,000
Remaining contractual life (Year)	10 months 2 days

Date the equity-based award expires, in YYYY-MM-DD format.

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

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

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

+ References

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

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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