Debt (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Mar. 31, 2009
Debt Instrument [Line Items]
Debt	$ 12,286,000		$ 13,464,000
Less current portion	(3,286,000)		(3,714,000)
Long-term debt	$ 9,000,000		9,750,000
Percent of subsidiary stock not security for financing	65.00%
Capex Loan Swap Agreement [Member]
Debt Instrument [Line Items]
Derivative, Fixed Interest Rate	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, is being amortized as an increase to interest expense of approximately $2,000 per month, or $1,000 net of tax, over the remaining term of the interest rate swap agreement.
Derivative, Variable Interest Rate	0.44%
Interest rate swaps	$ 0		2,000
Interest income (loss) for mark-to-market adjustment of swap fair value	2,000	$ 11,000
Derivative, Notional Amount	286,000		$ 714,000
Interest expense for settlements related to swaps	(2,000)	(11,000)
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
Debt Instrument, Basis Spread on Variable Rate	1.60%
Term Loan [Member]
Debt Instrument [Line Items]
Debt	$ 12,000,000		$ 12,750,000
Debt Instrument, Interest Rate, Stated Percentage	2.24%		2.04%
Proceeds from (Repayments of) Debt	$ 0	15,500,000
Repayments of Short-term Debt	$ 750,000	500,000
Capex Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.04%		2.04%
Debt - face amount	$ 12,000,000
Repayments of Short-term Debt	$ 428,000	$ 428,000