Note 9 - Leases - Lease Assets and Liabilities (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Operating lease right-of-use assets, net	$ 8,778,901	$ 9,224,840
Operating Leases (in years) (Year)	11 years	11 years
Operating Leases	5.00%	5.00%
Other Current Liabilities [Member]
Other current liabilities	$ 826,936	$ 850,664
Operating Lease Liabilities [Member]
Operating lease liabilities	8,109,118	8,513,448
Other Current Liabilities and Operating Lease Liabilities [Member]
Total operating lease liabilities	$ 8,936,054	$ 9,364,112