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Note 4 - Fair Value of Financial Instruments - Marketable Securities (Details)	Jun. 30, 2024 USD ($)
Commercial paper	$ 40,908,464
Commercial paper	3,306
Commercial paper	23,008
Commercial paper	40,888,762
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Commercial paper	25,828,920
Commercial paper	0
Commercial paper	20,543
Commercial paper	25,808,377
US Treasury Bond Securities [Member]
Commercial paper	9,286,150
Commercial paper	2,489
Commercial paper	1,254
Commercial paper	9,287,385
US Treasury Securities [Member]
Commercial paper	5,793,394
Commercial paper	817
Commercial paper	1,211
Commercial paper	$ 5,793,000

X

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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