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Debt and Leases - Debt (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Mar. 08, 2010	Dec. 31, 2008	May. 31, 1998
Debt:
Long-term Debt	$ 13,464,000	$ 5,196,000
Current portion of long-term debt	(3,714,000)	(4,482,000)
Long-term debt	9,750,000	714,000
Planned capital improvements excluded from fixed charge	18,000,000
Loans payable | Capex loan
Debt:
Long-term Debt	$ 714,000	$ 2,428,000
Stated interest rate	2.04%	1.76%
Repayment term	7 years
Debt instrument, face amount	$ 12,000,000
Debt Instrument, Description of Variable Rate Basis	30 day LIBOR
Basis spread on variable rate	1.60%	1.75%
Loans payable | Term Loan [Member]
Debt:
Long-term Debt	$ 12,750,000	$ 0
Repayments of Short-term Debt	$ 500,000
Stated interest rate	2.24%
Repayment term	5 years
Debt Instrument, Description of Variable Rate Basis	30 day LIBOR
Basis spread on variable rate	1.80%
Proceeds from (Repayments of) Debt	$ 15,500,000
Loans payable | Mexican Loan [Member]
Debt:
Stated interest rate		1.73%
Repayment term		5 years
Debt instrument, face amount				$ 8,000,000
Debt Instrument, Description of Variable Rate Basis		LIBOR
Basis spread on variable rate		1.60%	1.75%
Loans payable | Industrial Development Revenue Bond
Debt:
Stated interest rate		0.30%
Debt instrument, face amount	$ 3,332,493					$ 7,500,000
Loans payable | Mexican Expansion Revolving Loan
Debt:
Basis spread on variable rate	1.60%
Line of credit
Debt:
Percent of subsidiary stock not security for financing	65.00%
Line of credit facility, maximum borrowing capacity	$ 18,000,000
Debt Instrument, Description of Variable Rate Basis	daily LIBOR
Line of credit | Mexican Loan [Member]
Debt:
Debt instrument, face amount	$ 8,000,000
Line of credit | Revolving line of credit
Debt:
Long-term Debt	0	$ 2,768,000
Line of credit facility, maximum borrowing capacity	$ 18,000,000				$ 8,000,000
Basis spread on variable rate	1.60%	1.75%
Line of credit | Mexican Expansion Revolving Loan
Debt:
Mexican Expansion Revolving Loan, unused borrowing capacity, mount	$ 10,000,000

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