Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Current assets    
Cash and cash equivalents $ 8,785 $ 1,057
Treasury bills 0 7,697
Available-for-sale securities 45 45
Trade receivables, less allowance for doubtful accounts of $11 1,036 896
Inventories 1,695 1,618
Other current assets 159 155
Total current assets 11,720 11,468
Deferred income tax asset 203 192
Intangible assets, net 489 565
Property and equipment, net 1,063 1,050
Total assets 13,475 13,275
Current liabilities    
Current maturity of financing lease 5 5
Accounts payable 129 116
Accrued expenses 431 405
Total current liabilities 565 526
Long-term liabilities    
Financing lease, net of current maturities 19 24
Total long-term liabilities 19 24
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 2,030 2,019
Retained earnings 10,522 10,335
Accumulated other comprehensive gain (unrealized gain on available-for-sale securities, net of income tax) 0 32
Total stockholders' equity 12,891 12,725
Total liabilities and stockholders' equity $ 13,475 $ 13,275