Note 6 - Leases - Schedule of Supplemental Balance Sheet Information (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Operating leases:
Operating lease right-of-use assets	$ 69,444	$ 93,457
Current portion of operating lease obligations	36,169	33,118
Operating lease obligations, net of current portion	33,843	61,794
Total operating lease liabilities	70,012	94,912
Finance leases:
Current portion of finance lease obligations	0	2,844
Total finance lease liabilities		2,844
Finance Lease, Property, Plant and Equipment [Member]
Finance leases:
Property and equipment, at cost	54,346	54,066
Accumulated depreciation	$ (54,346)	(48,659)
Property and equipment, net		$ 5,407