Note 14 - Commitments - Lease Expense (Details) - USD ($)		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Cash paid for operating lease liabilities		$ 31,303	$ 17,264
Cash paid for finance lease liabilities		2,685	2,252
Right-of-use assets obtained in exchange for new operating lease liabilities (1)	[1]		(663,009)
Property and equipment obtained in exchange for new finance lease liabilities			$ (43,242)
Weighted-average remaining lease term - operating leases (years) (Year)		6 years	7 years
Weighted-average remaining lease term- finance leases (years) (Year)		3 years 292 days	4 years 292 days

[1] For the three months ended March 31, 2021, the balance includes operating leases existing as of the adoption of ASC 842 on January 1, 2021.