Quarterly report pursuant to Section 13 or 15(d)

Note 5 - Fair Value Measurements - Financial Assets Measured at Fair Value on Recurring Basis (Details)

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Note 5 - Fair Value Measurements - Financial Assets Measured at Fair Value on Recurring Basis (Details) - USD ($)
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Contingent consideration receivable $ 682,000 $ 682,000 $ 0
Fair Value, Recurring [Member]      
Contingent consideration receivable 682,000    
Money Market Funds [Member] | Fair Value, Recurring [Member]      
Money market funds 3,250   58,242
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]      
Contingent consideration receivable 0    
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] | Fair Value, Recurring [Member]      
Money market funds 3,250   58,242
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]      
Contingent consideration receivable 0    
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member] | Fair Value, Recurring [Member]      
Money market funds 0   0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]      
Contingent consideration receivable 682,000    
Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member] | Fair Value, Recurring [Member]      
Money market funds $ 0   $ 0