Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 8,212	$ 8,605
Accounts receivable, net of allowance for doubtful accounts of $5 and $2 respectively	2,850	2,261
Inventories	829	770
Prepaid expenses and other current assets	434	480
Total current assets	12,325	12,116
Property and equipment:
Furniture and fixtures	154	154
Leasehold improvements	6	6
Equipment	1,222	1,215
Property and equipment, Gross	1,382	1,375
Accumulated depreciation	1,114	1,072
Property and equipment, Net	268	303
Operating lease assets, net	82	136
Intangible assets, net	3,097	3,161
Deferred income taxes	5,507	5,708
TOTAL ASSETS	21,279	21,424
Current liabilities:
Accounts payable	301	547
Deferred revenue	38	37
Warranty	130	141
Accrued compensation	128	148
Operating lease obligations	75	126
Short-term debt	0	349
Other current liabilities	124	124
Total current liabilities	796	1,472
Operating lease obligations	6	8
Long-term debt	0	574
TOTAL LIABILITIES	802	2,054
Shareholders' equity:
Preferred stock, $0.01 par value; 5,000,000 shares authorized, none issued or outstanding	0	0
Common stock, $0.01 par value; 20,000,000 shares authorized, 5,354,337 and 5,352,626 issued and outstanding at March 31, 2021 and December 31, 2020, respectively	54	54
Additional paid-in capital	24,997	24,968
Accumulated other comprehensive loss	(203)	(150)
Accumulated deficit	(4,371)	(5,502)
Total shareholders' equity	20,477	19,370
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 21,279	$ 21,424