Note 8 - Leases (Details Textual) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Operating Lease, Right-of-Use Asset	$ 8,469,661	$ 9,052,941	$ 9,655,304
Operating Lease, Liability, Total	8,560,892	$ 9,105,503	9,655,304
Finance Lease, Liability, Total	$ 510,526		481,830
Finance Lease, Right-of-Use Asset, after Accumulated Amortization, Total			$ 481,830
Minimum [Member]
Lessee, Operating Lease, Renewal Term (Year)	1 year
Maximum [Member]
Lessee, Operating Lease, Renewal Term (Year)	20 years