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Note 3 - Summary of Significant Accounting Policies (Details Textual) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 USD ($) shares | Sep. 30, 2023 shares | Sep. 30, 2024 USD ($) shares | Sep. 30, 2023 shares | Dec. 31, 2023 USD ($)
Payments to Acquire Additional Interest in Subsidiaries |  |  | $ 205,000 |  |
Number of Operating Segments |  |  | 2 |  |
Cash, Uninsured Amount | $ 4,100,000 |  | $ 4,100,000 |  |
Marketable Securities, Current | 0 |  | 0 |  | $ 2,976,573
Accounts Receivable, Allowance for Credit Loss | $ 10,000 |  | $ 10,000 |  | 10,000
Weighted Average Number of Shares Outstanding, Basic (in shares) | shares | 79,966,833 | 73,730,921 | 80,165,181 | 72,374,693 |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares |  |  | 3,684,697 | 3,930,654 |
Marketable Securities |  |  |  |  | 2,976,573
US Treasury Securities [Member] |  |  |  |  |
Marketable Securities, Current |  |  |  |  | 3,000,000
Money Market Funds [Member] |  |  |  |  |
Cash Equivalents, at Carrying Value | $ 4,800,000 |  | $ 4,800,000 |  | $ 3,000,000

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