Note 10 - Leases - Lease Assets and Liabilities (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Operating lease right-of-use assets, net	$ 8,565,973	$ 8,856,820
Operating Leases (in years) (Year)	9 years	9 years
Operating Leases	5.00%	5.00%
Other Current Liabilities [Member]
Other current liabilities	$ 1,158,633	$ 1,136,300
Operating Lease Liabilities [Member]
Operating lease liabilities	7,638,786	7,901,357
Other Current Liabilities and Operating Lease Liabilities [Member]
Total operating lease liabilities	$ 8,797,419	$ 9,037,657