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Note 6 - Stock-based Compensation Expense (Details Textual)
6 Months Ended
Jun. 30, 2022
USD ($)
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount $ 1,039,762
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 1 year 10 months 24 days
Prepaid Expense, Value of Stock Issued for Services During Period $ 60,000