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Debt (Details) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015	Mar. 31, 2009
Debt Instrument [Line Items]
Debt	$ 11,250,000			$ 11,250,000		$ 13,464,000
Less current portion	(3,000,000)			(3,000,000)		(3,714,000)
Long-term debt	$ 8,250,000			$ 8,250,000		9,750,000
Percent of subsidiary stock not security for financing	65.00%			65.00%
Letter of Credit, Maximum	$ 250,000			$ 250,000		100,000
Capex Loan Swap Agreement [Member]
Debt Instrument [Line Items]
Derivative, Fixed Interest Rate	2.295%			2.295%
Derivative, Description of Variable Rate Basis				LIBOR
Description of Reclassification of Cash Flow Hedge Gain (Loss)				The pre-tax loss previously recognized in Accumulated Other Comprehensive Income, totaling $146,000 as of March 31, 2009, amortized as an increase to interest expense of approximately $2,000 per month, or $1,000 net of tax, through March 31, 2016.
Interest rate swaps	$ 0			$ 0		2,000
Interest income (loss) for mark-to-market adjustment of swap fair value	0	$ 9,000		2,000	$ 21,000
Derivative, Notional Amount	0			0		$ 714,000
Interest expense for settlements related to swaps	$ 0	$ (9,000)		(2,000)	(20,000)
Capex Loan Swap Agreement [Member] | Accumulated Other-than-Temporary Impairment [Member]
Debt Instrument [Line Items]
Pre-Tax Loss							$ 146,000
Amortization of Pre-Tax Loss to Interest Expense, Before Tax, Monthly				2,000
Amortization of Pre-Tax Loss to Interest Expense, Net of Tax, Monthly				$ 1,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage
Maximum borrowing capacity	$ 18,000,000			$ 18,000,000
Debt Instrument, Basis Spread on Variable Rate				1.60%
Term Loan [Member]
Debt Instrument [Line Items]
Debt	$ 11,250,000			$ 11,250,000		$ 12,750,000
Debt Instrument, Interest Rate, Stated Percentage	2.30%			2.30%		2.24%
Proceeds from (Repayments of) Debt				$ 0	15,500,000
Repayments of Short-term Debt			$ 500,000	$ 1,500,000	1,250,000
Capex Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.00%			0.00%		2.04%
Debt - face amount	$ 12,000,000			$ 12,000,000
Repayments of Short-term Debt				$ 714,000	$ 857,000

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