Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net income (loss)	$ (3,777)	$ 5,547	$ 1,120
Loss from discontinued operations, net of tax	1,713	1,215	1,334
Income (loss) from continuing operations	(2,064)	6,762	2,454
Adjustments to reconcile net income (loss) from continuing operations to net cash provided by operating activities:
Depreciation and amortization	3,277	2,891	2,134
Impariment of goodwill and intangible assets	3,765
Loss on disposition of property			9
Equity in loss of partnerships	288	390	421
Amortization of debt issuance costs		158	80
Stock-based compensation	1,886	1,395	844
Change in allowance for doubtful accounts	(482)	475	162
Changes in operating assets and liabilities:
Accounts receivable	2,769	(3,219)	(2,042)
Inventories	1,609	(5,086)	(2,643)
Contract assets	(4,613)	(2,645)	(1,117)
Other assets	440	(403)	(933)
Accounts payable	(3,057)	1,851	3,767
Accrued expenses	(2,077)	(700)	2,120
Other liabilities	(216)	(394)	106
Net cash provided by operating activities of continuing operations	1,525	1,475	5,362
Net cash (used in) operating activities of discontinued operations	(55)	(1,298)	(1,132)
Net cash provided by operating activities	1,470	177	4,230
Cash flows from investing activities:
Proceeds from sale of machinery and equipment			19
Purchases of machinery and equipment	(4,593)	(5,503)	(2,266)
Payments for acquistion of other assets	(818)
Purchase of investment securities	(43,797)	(38,093)
Proceeds from sale of investment securities	38,015
Proceeds from maturities of investment securities	11,575
Purchase of Hearing Help Express			(650)
Investment in partnerships	(609)	(1,397)	(1,776)
Net cash provided by (used in) investing activities of continuing operations	(227)	(44,993)	(4,673)
Net cash (used in) investing activities of discontinued operations	(15)	(4)	(47)
Net cash (used in) investing activities	(242)	(44,997)	(4,720)
Cash flows from financing activities:
Proceeds from long-term debt		14,169	19,162
Repayments of long-term debt		(25,868)	(19,373)
Payment of debt issuance costs		(88)	(139)
Proceeds from issuance of common stock, net of costs		88,967
Payments for repurchase of common stock and related costs		(25,907)
Payment of financing leases	(111)
Exercise of stock options and employee stock purchase plan shares	306	727	314
Withholding of common stock upon vesting of restricted stock units	(304)
Net cash provided by (used in) financing activities	(109)	52,000	(36)
Effect of exchange rate changes on cash of continuing operations	1	(141)	268
Effect of exchange rate changes on cash of discontinued operations	(5)	(9)	13
Effect of exchange rate changes on cash	(4)	(150)	281
Net change in cash, cash equivalents and restricted cash	1,115	7,030	(245)
Cash, cash equivalents and restricted cash, beginning of period	8,047	1,017	1,262
Cash, cash equivalents and restricted cash, end of period	$ 9,162	$ 8,047	$ 1,017