Condensed Balance Sheets - USD ($)
$ in Thousands |
Mar. 31, 2021 |
Dec. 31, 2020 |
| Current assets |
|
|
| Cash and cash equivalents |
$ 1,045
|
$ 1,090
|
| Investments |
8,042
|
8,041
|
| Trade receivables, less allowance for doubtful accounts of $11 |
1,209
|
957
|
| Inventories |
1,568
|
1,572
|
| Other current assets |
206
|
170
|
| Income tax receivable |
19
|
26
|
| Total current assets |
12,089
|
11,856
|
| Deferred income tax asset, net |
253
|
246
|
| Intangible assets, net |
163
|
228
|
| Property and equipment, net |
964
|
989
|
| Total assets |
13,469
|
13,319
|
| Current liabilities |
|
|
| Current maturities of financing lease |
6
|
6
|
| Accounts payable |
190
|
197
|
| Accrued expenses |
489
|
330
|
| Total current liabilities |
685
|
533
|
| Long-term liabilities |
|
|
| Financing lease, net of current maturities |
11
|
12
|
| Total long-term liabilities |
11
|
12
|
| 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 |
2,037
|
2,036
|
| Retained earnings |
10,396
|
10,398
|
| Accumulated other comprehensive gain (unrealized gain on available-for-sale securities, net of income tax) |
1
|
1
|
| Total stockholders' equity |
12,773
|
12,774
|
| Total liabilities and stockholders' equity |
$ 13,469
|
$ 13,319
|