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Note 5 - Fair Value Measurements - Financial Assets Measured at Fair Value on Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($)
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]        
Money market funds $ 980,112     $ 1,600,663
Fair Value, Inputs, Level 3 [Member]        
Fair value of contingent consideration       930,000
December 31, 2021 0 $ 0 $ 942,609 930,000
Change in fair value 0 $ (942,609) $ 12,609  
Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member]        
Money market funds $ 980,112     $ 1,660,663