Note 14 - Commitments - Lease Expense (Details) - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Cash paid for operating lease liabilities		$ 30,820	$ 39,555	$ 48,084	$ 79,109
Cash paid for finance lease liabilities		$ 2,685		4,937
Right-of-use assets obtained in exchange for new operating lease liabilities (1)	[1]			663,009	175,557
Property and equipment obtained in exchange for new finance lease liabilities				$ 43,242
Weighted-average remaining lease term - operating leases (Year)		7 years	0 years	7 years	0 years
Weighted-average remaining lease term- finance leases (Year)		5 years	0 years	5 years	0 years

[1] For the Six months ended June 30, 2019, the balance includes operating leases existing as of the adoption of ASC 842 on January 1, 2019.