Note 4 - Property and Equipment - Summary of Property and Equipment (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Property and equipment, gross	$ 64,077,000	$ 63,553,000
Less accumulated depreciation and amortization	(20,198,000)	(19,582,000)
Property and equipment, net	43,879,000	43,971,000
Land and Land Improvements [Member]
Property and equipment, gross	14,118,000	14,118,000
Building and Building Improvements [Member]
Property and equipment, gross	34,043,000	33,533,000
Machinery and Equipment [Member]
Property and equipment, gross	9,056,000	9,015,000
Vehicles [Member]
Property and equipment, gross	445,000	445,000
Office Equipment [Member]
Property and equipment, gross	6,232,000	5,963,000
Construction in Progress [Member]
Property and equipment, gross	$ 183,000	$ 479,000