Quarterly report pursuant to Section 13 or 15(d)

Note 8 - Stockholders' Equity - Stock-based Compensation for Restricted Stock Units (Details)

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Note 8 - Stockholders' Equity - Stock-based Compensation for Restricted Stock Units (Details) - Restricted Stock Units (RSUs) [Member] - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Share-based compensation expense $ 65,002 $ 121,021 $ 130,004 $ 189,717
General and Administrative Expense [Member]        
Share-based compensation expense 65,002 65,003 130,004 130,005
Selling and Marketing Expense [Member]        
Share-based compensation expense $ 0 $ 56,018 $ 0 $ 59,712