Note 4 - Leases - Balance Sheet Information (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Operating Lease, Right-of-Use Asset	$ 5,053,614
Operating lease liabilities – current	999,685
Operating lease liabilities – non-current	4,141,855
Operating Lease, Liability, Total	5,141,540
Property and equipment, at cost	1,362,272	1,182,778
Accumulated depreciation	(1,156,145)	(1,169,272)
Property and equipment, net	206,127	13,506
Finance lease liabilities – current	34,772	13,789
Finance lease liabilities – non-current	172,273
Total lease liability	$ 207,044	$ 13,789
Operating leases (Year)	10 years 73 days
Finance lease (Year)	5 years 182 days	292 days
Operating leases	6.40%
Finance leases	3.90%	7.30%