Note 6 - Property and Equipment - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Property and equipment, gross	$ 65,656	$ 64,406
Less accumulated depreciation and amortization	(22,345)	(21,872)
Property and equipment, net	43,311	42,534
Land and Land Improvements [Member]
Property and equipment, gross	14,231	14,231
Building and Building Improvements [Member]
Property and equipment, gross	36,691	36,185
Machinery and Equipment [Member]
Property and equipment, gross	4,562	4,508
Office Equipment [Member]
Property and equipment, gross	6,534	6,458
Vehicles [Member]
Property and equipment, gross	455	455
Construction in Progress [Member]
Property and equipment, gross	$ 3,183	$ 2,569

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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