Short And Long-Term Debt (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Short And Long-Term Debt Instrument [Line Items]
Percentage of proceeds from certain asset sales required to pay down term loan	100.00%
Interest expense	$ 553,000	$ 369,000	$ 461,000
Debt	11,711,000
Interest Rate Swap [Member]
Short And Long-Term Debt Instrument [Line Items]
Other current liabilities	19,000	41,000
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	$ 6,000,000
Quarterly installments	250,000
Debt	5,250,000	$ 4,250,000
Note Payable [Member]
Short And Long-Term Debt Instrument [Line Items]
Debt	$ 2,000,000
Debt instrument, frequency of periodic payment, months	48
Notes payable, interest rate	5.00%
Interest only payment term	12 months
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] | London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap [Member]
Short And Long-Term Debt Instrument [Line Items]
Basis spread on variable rate of debt instruments	0.80%
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] | London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap [Member]
Short And Long-Term Debt Instrument [Line Items]
Basis spread on variable rate of debt instruments	1.45%
Maximum [Member] | Federal Funds Rate [Member]
Short And Long-Term Debt Instrument [Line Items]
Basis spread on variable rate of debt instruments	1.25%
Revolving Credit Facility [Member]
Short And Long-Term Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	$ 9,000,000
Credit facility, non-use fee percentage	0.25%
Weighted average interest rate of debt instruments	4.36%	3.68%	4.51%
Credit facility, outstanding balance	$ 3,218,000	$ 4,674,000
Credit facility, available borrowing capacity	5,121,000	3,326,000
Interest expense	57,000	$ 72,000	$ 56,000
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]
Weighted average interest rate of debt instruments	3.50%	3.37%	4.50%
Credit facility, outstanding balance	$ 1,243,000	$ 913,000
Credit facility, available borrowing capacity	$ 455,000	$ 817,000
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%
Hearing Help Express (HHE) [Member] | Note Payable [Member]
Short And Long-Term Debt Instrument [Line Items]
Ownership percentage held by third party	80.00%