Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Cash flows from (used in) operating activities
Net income	$ 295	$ 202
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	308	313
Deferred income taxes	(4)	(18)
Change in contingent earn-out fair value	(45)	(260)
Stock-based compensation expense	51	74
Other	(34)	(20)
Change in:
Trade receivables	(135)	(81)
Inventories	(37)	49
Current assets	33	(4)
Accounts payable	(61)	103
Accrued expenses	76	(92)
Income taxes receivable	21	(70)
Net cash from operating activities	468	196
Cash flows from (used in) investing activities
Purchases of treasury bills	(8,681)	(8,866)
Proceeds from the maturity of treasury bills	8,450	9,339
Purchase of property and equipment	(114)	(8)
Net cash from (used in) investing activities	(345)	465
Cash flows used in financing activities
Payments on long-term debt	0	(390)
Net cash used in financing activities	0	(390)
Net increase in cash and cash equivalents	123	271
Cash and cash equivalents, beginning	840	569
Cash and cash equivalents, ending	963	840
Supplemental cash flow information
Cash paid during the year for income taxes	196	90
Cash paid during the year for interest	$ 0	$ 10