Note 8 - Leases - Supplemental Balance Sheet Information Related to Operating and Finance Leases (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Property and equipment, gross	$ 41,580,085		$ 40,820,575
Less: Accumulated depreciation	(16,997,434)		(18,170,554)
Property and equipment, net	24,582,651	$ 22,650,021	$ 22,650,021
Current portion of obligations under capital leases	262,904	164,894
Obligations under capital leases, non-current	1,272,845	120,705
Total finance lease liabilities	$ 1,535,749	$ 285,599
Weighted Average Remaining Lease Term Finance leases (Month)	5 years 90 days	2 years 90 days
Finance leases	7.49%	8.05%
Finance Lease [Member]
Property and equipment, gross	$ 2,917,573	$ 1,484,911
Less: Accumulated depreciation	(956,632)	(810,753)
Property and equipment, net	$ 1,960,941	$ 674,158