Consolidated Condensed Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income	$ 775	$ 769
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	810	654
Equity in loss of partnerships	65	116
Stock-based compensation	329	333
Change in allowance for doubtful accounts	(439)	151
Changes in operating assets and liabilities:
Accounts receivable	1,301	(2,407)
Inventories	(171)	(1,183)
Contract assets	(696)	(1,787)
Other assets	971	139
Accounts payable	(1,108)	2,262
Accrued expenses	(1,431)	(316)
Other liabilities	29	14
Net cash provided by (used in) operating activities	435	(1,255)
Cash flows from investing activities:
Purchases of machinery and equipment	(954)	(485)
Payments for acquistion of intangible assets	(586)
Purchase of investment securities	(34,516)
Proceeds from sale of investment securities	38,015
Proceeds from maturities of investment securities	3,464
Investment in partnerships	(568)	(164)
Net cash provided by (used in) investing activities	4,855	(649)
Cash flows from financing activities:
Proceeds from long-term debt		6,106
Repayments of long-term debt		(4,550)
Payment of financing leases	(32)
Exercise of stock options and employee stock purchase plan shares	88	267
Withholding of common stock upon vesting of restricted stock units	(235)
Net cash provided by (used in) financing activities	(179)	1,823
Effect of exchange rate changes on cash	32	120
Net increase in cash	5,143	39
Cash, cash equivalents and restricted cash, beginning of period	8,047	1,017
Cash, cash equivalents and restricted cash, end of period	13,190	1,056
Noncash investing and financing:
Acquisition of machinery and equipment in accounts payable	160	305
Investment in partnerships through liability incurred		$ 308
Fitting software other asset through liabilities incurred and exchange of investment in partnership	$ 3,093