Consolidated Condensed Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net income (loss)	$ 672	$ (1,979)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	1,440	921
Equity in loss of partnerships	60	45
Stock-based compensation	453	376
Change in fair value of contingent consideration	35
Provision for doubtful accounts	(58)	6
Changes in operating assets and liabilities:
Accounts receivable	726	746
Inventories	(821)	(2,738)
Contract assets	320	158
Other assets	(410)	491
Accounts payable	3,491	327
Accrued expenses	206	340
Other liabilities	(249)	71
Net cash provided by (used in) operating activities	5,865	(1,236)
Cash flows from investing activities:
Purchases of property, plant and equipment	(851)	(1,678)
Payments on liabilities for acquisition of intangible assets		(91)
Purchase of investment securities	(5,412)	(76)
Proceeds from maturities of investment securities	3,752	9,850
Net cash (used in) provided by investing activities	(2,511)	8,005
Cash flows from financing activities:
Payment of financing leases	(11)	(28)
Payments on liabilities for acquisition of intangible assets	(53)
Exercise of stock options and employee stock purchase plan shares	60	68
Withholding of common stock upon vesting of restricted stock units	(241)	(198)
Net cash (used in) financing activities	(245)	(158)
Effect of exchange rate changes on cash	22	20
Net increase in cash	3,131	6,631
Cash, cash equivalents and restricted cash, beginning of period	9,280	9,162
Cash, cash equivalents and restricted cash, end of period	12,411	15,793
Non-cash investing and financing:
Acquisition of property, plant and equipment in accounts payable	$ 122	$ 187