Consolidated Condensed Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net (loss) income	$ (1,979)	$ 775
Loss from discontinued operations		193
(Loss) income from continuing operations	(1,979)	968
Adjustments to reconcile net (loss) income from continuing operations to net cash provided by operating activities:
Depreciation and amortization	921	797
Equity in loss of partnerships	45	65
Stock-based compensation	376	329
Change in allowance for doubtful accounts	6	(439)
Changes in operating assets and liabilities:
Accounts receivable	746	1,438
Inventories	(2,738)	(220)
Contract assets	158	(696)
Other assets	488	877
Accounts payable	327	(983)
Accrued expenses	340	(1,453)
Other liabilities	71	29
Net cash (used in) provided by operating activities of continuing operations	(1,239)	712
Net cash provided by (used in) operating activities of discontinued operations	3	(277)
Net cash (used in) provided by operating activities	(1,236)	435
Cash flows from investing activities:
Purchases of machinery and equipment	(1,678)	(938)
Payments for acquisition of other assets	(91)	(586)
Purchase of investment securities	(76)	(34,516)
Proceeds from sale of investment securities		38,015
Proceeds from maturities of investment securities	9,850	3,464
Investment in partnerships		(568)
Net cash provided by investing activities of continuing operations	8,005	4,871
Net cash used in investing activities of discontinued operations		(16)
Net cash provided by investing activities	8,005	4,855
Cash flows from financing activities:
Payment of financing leases	(28)	(32)
Exercise of stock options and employee stock purchase plan shares	68	88
Withholding of common stock upon vesting of restricted stock units	(198)	(235)
Net cash (used in) financing activities	(158)	(179)
Effect of exchange rate changes on cash	20	32
Net increase in cash	6,631	5,143
Cash, cash equivalents and restricted cash, beginning of period	9,162	8,047
Cash, cash equivalents and restricted cash, end of period	15,793	13,190
Non-cash investing and financing:
Acquisition of machinery and equipment in accounts payable	$ 187	160
Fitting software other asset through liabilities incurred and exchange of investment in partnership		$ 3,093