Note 9 - Leases - Lease Assets and Liabilities (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Operating lease right-of-use assets, net	$ 9,007,314	$ 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	$ 727,961	$ 850,664
Operating Lease Liabilities [Member]
Operating lease liabilities	8,425,563	8,513,448
Other Current Liabilities and Operating Lease Liabilities [Member]
Total operating lease liabilities	$ 9,153,524	$ 9,364,112