Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net income (loss)	$ (4,744)	$ 2,117	$ 2,248
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,041	1,755	2,182
Stock-based compensation	685	579	457
Loss on impairment of assets of discontinued operations	796
Change in deferred gain	(55)	(110)	(110)
Loss on disposal of property, plant and equipment	55
Change in allowance for doubtful accounts	35	15	(4)
Equity in loss of partnerships	78	208	228
Amortization of debt issuance costs	57
Loss on sale of discontinued operations			120
Changes in operating assets and liabilities:
Accounts receivable	1,493	(842)	(2,183)
Inventories	1,813	(4,329)	(677)
Other assets	(741)	(13)	301
Accounts payable	(1,386)	1,588	626
Accrued expenses	(545)	(118)	(347)
Other liabilities	13	(186)	317
Net cash (used in) provided by operating activities	(405)	664	3,158
Cash flows from investing activities:
Proceeds from sale of property, plant and equipment			66
Proceeds of sale of discontinued operations			500
Purchases of property, plant and equipment	(1,766)	(3,982)	(1,524)
Net cash used in investing activities	(2,302)	(4,179)	(958)
Cash flows from financing activities:
Proceeds from long-term borrowings	19,357	19,615	13,153
Repayments of long-term borrowings	(19,525)	(16,284)	(15,221)
Payment of debt issuance costs	(140)
Proceeds from equity offering, net of offering costs	3,678
Proceeds from employee stock purchases and exercise of stock options	138	340	165
Change in restricted cash	23	60	(32)
Net cash provided by (used in) financing activities	3,531	3,731	(1,935)
Effect of exchange rate changes on cash	(524)	(177)	(154)
Net increase in cash	300	39	111
Cash, beginning of year	367	328	217
Cash, end of year	667	367	$ 328
PC Werth Ltd [Member]
Cash flows from investing activities:
Purchase of businesses, net of cash received (Note 4)		$ (197)
Hearing Help Express (HHE) [Member]
Cash flows from investing activities:
Purchase of businesses, net of cash received (Note 4)	$ (536)