Condensed Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents	$ 9,518	$ 6,713
Investments	56	3,056
Trade receivables, less allowance for doubtful accounts of $11	1,180	1,005
Inventories	1,790	1,663
Other current assets	175	188
Income tax receivable	56	3
Total current assets	12,775	12,628
Deferred income tax asset, net	223	208
Intangible assets, net	0	38
Property and equipment, net	955	1,017
Total assets	13,953	13,891
Current liabilities
Current maturities of financing lease	7	6
Accounts payable	301	349
Accrued expenses	592	342
Total current liabilities	900	697
Long-term liabilities
Financing lease, net of current maturities	1	6
Total long-term liabilities	1	6
Commitments and contingencies
Stockholders' equity
Common stock par value $0.10 per share; authorized 10,000,000 shares; 3,403,021 and 3,395,521 shares issued and outstanding, respectively	340	339
Additional paid-in capital	2,075	2,041
Retained earnings	10,637	10,808
Total stockholders' equity	13,052	13,188
Total liabilities and stockholders' equity	$ 13,953	$ 13,891