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Note 3 - Investments and Marketable Securities - Summary of Assets Measured at Fair Value By Measurement Input Level (Details) - USD ($)	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Balance at December 31, 2022	$ 3,216,280
Purchases	6,418,134	$ 22,573,384
Sales	(9,694,625)	$ (25,523,637)
Change in fair value	62,487
Balance at June 30, 2023	2,276
Fair Value, Inputs, Level 1 [Member]
Balance at December 31, 2022	3,216,280
Purchases	6,418,134
Sales	(9,694,625)
Change in fair value	62,487
Balance at June 30, 2023	2,276
Fair Value, Inputs, Level 2 [Member]
Balance at December 31, 2022	0
Purchases	0
Sales	0
Change in fair value	0
Balance at June 30, 2023	0
Fair Value, Inputs, Level 3 [Member]
Balance at December 31, 2022	0
Purchases	0
Sales	0
Change in fair value	0
Balance at June 30, 2023	$ 0

X

- Definition

Amount of investment in marketable security, classified as current.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(2))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

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X

- Definition

Amount of unrealized gain (loss) on investment in marketable security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(7)(c))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2

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X

- Definition

Amount of cash outflow for purchase of marketable security.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481830/320-10-45-11

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- Definition

The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

+ References

No definition available.

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