Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022		Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 4,407		$ 8,229
Accounts receivable, net of allowance for doubtful accounts of $4 and $18 respectively	2,454		2,369
Inventories	1,366		1,429
Investments in held-to-maturity debt securities	76		0
Investments in equity securities	343	[1]	0
Prepaid expenses and other current assets	996		355
Total current assets	9,642		12,382
Property and equipment:
Furniture and fixtures	136		136
Leasehold improvements	6		6
Equipment	953		994
Real property	2,059		2,059
Property and equipment, Gross	3,154		3,195
Accumulated depreciation	956		958
Property and equipment, Net	2,198		2,237
Operating lease assets, net	14		58
Intangible assets, net	2,979		2,866
Deferred income taxes	4,825		4,824
Long-term investments in held-to-maturity debt securities	2,338		0
TOTAL ASSETS	21,996		22,367
Current liabilities:
Accounts payable	406		236
Deferred revenue	111		107
Warranty	125		128
Accrued compensation	53		132
Operating lease obligations	14		59
Current maturities of long-term debt	56		56
Other current liabilities	238		181
Total current liabilities	1,003		899
Long-term debt	1,660		1,674
TOTAL LIABILITIES	2,663		2,573
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, 5,391,488 and 5,378,857 issued and outstanding at March 31, 2022 and December 31, 2021, respectively	54		54
Additional paid-in capital	25,396		25,167
Accumulated other comprehensive loss	(350)		(288)
Accumulated deficit	(5,767)		(5,139)
Total shareholders' equity	19,333		19,794
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 21,996		$ 22,367

[1] The fair value of the Company's equity investments are determined based on readily available market data, and are classified as level 1 fair value measurements.