Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities
Net income (loss)	$ 187	$ (10)
Adjustments to reconcile net income (loss) to net cash from operating activities:
Depreciation and amortization	320	321
Deferred income taxes	(2)	(16)
Stock-based compensation expense	11	15
Interest accrued on treasury bills	(182)	(114)
Change in:
Trade receivables	(140)	6
Inventories	(77)	(66)
Other current assets	(4)	(14)
Accounts payable	13	(62)
Accrued expenses	26	25
Income taxes receivable	0	45
Net cash from operating activities	152	130
Cash flows from investing activities
Purchases of treasury bills	(7,662)	(14,353)
Proceeds from the maturity of treasury bills	15,500	14,500
Purchase of intangible asset	(150)	0
Purchase of property and equipment	(107)	(32)
Net cash from investing activities	7,581	115
Cash flows used in financing activities
Payments on financing lease	(5)	(1)
Payment of contingent earn-out	0	(150)
Net cash used in financing activities	(5)	(151)
Net increase in cash and cash equivalents	7,728	94
Cash and cash equivalents, beginning	1,057	963
Cash and cash equivalents, ending	8,785	1,057
Supplemental cash flow information
Cash paid during the year for income taxes	1	1
Cash paid during the year for interest	2	1
Supplemental disclosures of non-cash investment and financing activity
Right-of-use assets obtained in exchange for finance lease obligations	$ 0	$ 30