Note 6 - Property and Equipment, Net - Property and Equipment (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Property and equipment, gross	$ 66,168,472	$ 40,820,575
Less: accumulated depreciation	(28,630,325)	(18,170,554)
Property and equipment, net	37,538,147	22,650,021
Land [Member]
Property and equipment, gross	2,010,253	1,608,647
Building and Building Improvements [Member]
Property and equipment, gross	26,903,528	18,784,628
Machinery and Equipment [Member]
Property and equipment, gross	13,412,961	10,160,205
Vehicles [Member]
Property and equipment, gross	$ 23,841,730	$ 10,267,095

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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