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Note 6 - Fair Value Measurements - Consideration and Methods for Valuing (Details) (Parentheticals) - GMI Subsidiary [Member] | 12 Months Ended
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Dec. 31, 2022 USD ($)
Cash, closing price | $ 1,000,000
Contingent annual payments | $ 4,000,000
Contingent Liability, Percentage of Net Revenue | 5.00%
Contingent payments, term (Year) | 7 years
Contingent payments, discount rate | 40.80%

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