Property and Equipment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 83,102,000	$ 83,182,000
Less accumulated depreciation	(43,201,512)	(41,486,000)
Property and equipment, net	39,900,000	41,696,000
Depreciation	7,193,000	6,127,000	$ 4,815,000
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,828,000	3,828,000
Building and improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	22,407,000	22,323,000
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	299,000	351,000
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	40,788,000	42,869,000
Office and computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	15,729,000	13,760,000
Motor vehicles
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 51,000	$ 51,000