Note 8 - Commitments and Contingencies - Other Supplemental Information Related to Leases (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating leases (Year)	2 years 3 months
Finance leases (Year)	4 years 7 months 17 days
Operating leases	7.00%
Finance leases	6.93%
Operating cash flows from operating leases	$ 32,473
Operating cash flows from finance leases	54,070
Financing cash flows from finance leases	$ 146,246	$ 13,934