Condensed Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 2,262	$ 8,785
Investments	6,790	45
Trade receivables, less allowance for doubtful accounts of $11	1,054	1,036
Inventories	1,735	1,695
Other current assets	163	159
Income tax receivable	11	0
Total current assets	12,015	11,720
Deferred income tax asset, net	221	203
Intangible assets, net	359	489
Property and equipment, net	1,024	1,063
Total assets	13,619	13,475
Current liabilities
Current maturities of financing lease	6	5
Accounts payable	144	129
Accrued expenses	632	431
Total current liabilities	782	565
Long-term liabilities
Financing lease, net of current maturities	15	19
Total long-term liabilities	15	19
Commitments and contingencies
Stockholders' equity
Common stock par value $0.10 per share; authorized 10,000,000 shares; 3,395,521 shares issued and outstanding	339	339
Additional paid-in capital	2,034	2,030
Retained earnings	10,449	10,522
Total stockholders' equity	12,822	12,891
Total liabilities and stockholders' equity	$ 13,619	$ 13,475