Short And Long-Term Debt (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Feb. 28, 2015
Short And Long-Term Debt Instrument [Line Items]
Quarterly installments	$ 250,000
Percentage of proceeds from certain asset sales required to pay down term loan	100.00%
Line of Credit Facility, Interest Rate During Period	3.68%	4.51%	4.30%
Amount considered debt default	$ 50,000
Interest Rate Swap [Member]
Short And Long-Term Debt Instrument [Line Items]
Other current liabilities	39,000	$ 19,000
Quarterly installments	250,000
Interest rate swap, notional amount	$ 3,750,000
Federal Funds Rate [Member]
Short And Long-Term Debt Instrument [Line Items]
Basis spread on variable rate of debt instruments	0.50%
Domestic Term-Loan [Member]
Short And Long-Term Debt Instrument [Line Items]
Loan amount	$ 5,000,000			$ 1,750,000
Seventh Amendment To The Loan And Security Agreement [Member]
Short And Long-Term Debt Instrument [Line Items]
Increase in the annual capital expenditure limit	4,500,000
Seventh Amendment To The Loan And Security Agreement [Member] | Domestic Term-Loan [Member]
Short And Long-Term Debt Instrument [Line Items]
Loan amount	5,000,000
Additional term loan facility borrowed	$ 3,250,000
Debt instrument maturity date	Feb. 28, 2019
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Short And Long-Term Debt Instrument [Line Items]
Basis spread on variable rate of debt instruments	2.50%
Minimum [Member] | Federal Funds Rate [Member]
Short And Long-Term Debt Instrument [Line Items]
Basis spread on variable rate of debt instruments	0.00%
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Short And Long-Term Debt Instrument [Line Items]
Basis spread on variable rate of debt instruments	4.00%
Maximum [Member] | Federal Funds Rate [Member]
Short And Long-Term Debt Instrument [Line Items]
Basis spread on variable rate of debt instruments	1.25%
Maximum [Member] | Seventh Amendment To The Loan And Security Agreement [Member]
Short And Long-Term Debt Instrument [Line Items]
Investment spending prior to requiring bank approval	$ 4,000,000
Revolving Credit Facility [Member]
Short And Long-Term Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	$ 8,000,000
Credit facility, non-use fee percentage	0.25%
Credit facility, outstanding balance	$ 4,674,000	3,843,000
Credit facility, available borrowing capacity	3,326,000	3,456,000
Letters Of Credit [Member]
Short And Long-Term Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	200,000
International Credit Facility [Member]
Short And Long-Term Debt Instrument [Line Items]
Credit facility, outstanding balance	913,000	920,000
Credit facility, available borrowing capacity	$ 817,000	$ 956,000
Line of Credit Facility, Interest Rate During Period	3.37%	4.50%
International Credit Facility [Member] | Minimum [Member]
Short And Long-Term Debt Instrument [Line Items]
Basis spread on variable rate of debt instruments	0.75%
International Credit Facility [Member] | Maximum [Member]
Short And Long-Term Debt Instrument [Line Items]
Basis spread on variable rate of debt instruments	2.50%