Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets
Cash and cash equivalents	$ 9,870	$ 7,646
Treasury Bills	0	1,980
Equity securities	56	56
Trade receivables, less allowance for credit losses of $11	1,283	1,161
Inventories	1,751	1,745
Other current assets	179	214
Income tax receivable	0	11
Total current assets	13,139	12,813
Deferred income tax asset	355	256
Property and equipment, net	951	975
Total assets	14,445	14,044
Current liabilities
Current maturity of financing lease	0	6
Accounts payable	291	274
Accrued expenses	323	350
Accrued income taxes	76	0
Total current liabilities	690	630
Commitments and contingencies
Stockholders' equity
Common stock par value $0.10 per share; authorized 10,000,000 shares; 3,428,021 shares issued and outstanding	342	342
Additional paid-in capital	2,230	2,163
Retained earnings	11,183	10,908
Accumulated other comprehensive income (unrealized income on available-for-sale securities, net of income tax)	0	1
Total stockholders' equity	13,755	13,414
Total liabilities and stockholders' equity	$ 14,445	$ 14,044