CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 8,605	$ 5,118
Accounts receivable, net of allowance for doubtful accounts of $2 and $19, respectively	2,261	3,126
Inventories	770	781
Prepaid expenses and other current assets	480	463
Total current assets	12,116	9,488
Property and equipment:
Furniture and fixtures	154	163
Leasehold improvements	6	6
Equipment	1,215	1,339
Total property and equipment	1,375	1,508
Accumulated depreciation	1,072	1,089
Net property and equipment	303	419
Intangible assets, net	3,161	3,875
Deferred income taxes	5,708	5,220
Operating lease asset, net	136	181
TOTAL ASSETS	21,424	19,183
Current liabilities:
Accounts payable	547	373
Deferred revenue	37	28
Warranty	141	313
Accrued compensation	148	105
Operating lease obligation	126	181
Short-term debt	349	0
Other current liabilities	124	231
Total current liabilities	1,472	1,231
Non-current liabilities
Operating lease obligation	8	19
Long-term debt	574	0
TOTAL LIABILITIES	2,054	1,250
Shareholders' equity
Preferred stock, $.01 par value; 5,000,000 shares authorized, none issued or outstanding	0	0
Common stock, $.01 par value; 20,000,000 shares authorized, 5,352,626 and 5,322,849 issued and outstanding, respectively	54	53
Additional paid-in capital	24,968	24,751
Accumulated other comprehensive loss	(150)	(306)
Accumulated deficit	(5,502)	(6,565)
Total shareholders' equity	19,370	17,933
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 21,424	$ 19,183