Note 8 - Stock-based Compensation Expense - Compensation Expense (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Stock-based compensation	$ 97,110	$ 50,373
Cost of Revenue [Member]
Stock-based compensation	16,029	0
Engineering, Research and Development [Member]
Stock-based compensation	3,941	0
Selling and Shipping [Member]
Stock-based compensation	5,246	0
General and Administrative [Member]
Stock-based compensation	$ 71,894	$ 50,373