Condensed Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities
Net income (loss)	$ (119)	$ 91
Adjustments to reconcile net income (loss) to net cash from operating activities:
Depreciation and amortization	272	231
Deferred income taxes	(24)	(6)
Stock-based compensation expense	5	8
Interest accrued on treasury bills	(2)	(120)
Other Noncash Expense	3	0
Change in:
Trade receivables	(3)	(69)
Inventories	36	(101)
Other current assets	(37)	(39)
Accounts payable	52	80
Accrued expenses	142	105
Income tax receivable/payable	(23)	30
Net cash from operating activities	302	210
Cash flows from (used in) investing activities
Purchases of treasury bills	(7,747)	(7,662)
Proceeds from the maturity of treasury bills	5,750	9,750
Purchase of intangible asset	0	(150)
Purchase of property and equipment	(24)	(84)
Net cash from (used in) investing activities	(2,021)	1,854
Cash flows used in financing activities
Payments on financing lease	(4)	(4)
Proceeds from loans	645	0
Repayment of loan principal	(645)	0
Net cash used in financing activities	(4)	(4)
Net increase (decrease) in cash and cash equivalents	(1,723)	2,060
Cash and cash equivalents, beginning	8,785	1,057
Cash and cash equivalents, ending	7,062	3,117
Supplemental cash flow information
Cash paid for income taxes	20	1
Cash paid for interest	$ 3	$ 1