CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash	$ 957	$ 1,194
Trade accounts receivable, less allowance for doubtful accounts of $9 for both December 31, 2020 and 2019	2,932	970
Inventories, net	4,340	2,554
Prepaid expenses and other current assets	606	267
Total current assets	8,835	4,985
Equipment and leasehold improvements, net	2,868	2,255
Operating leases, right of use	1,827	2,119
Other assets, net	10	13
Total assets	13,540	9,372
Current liabilities:
Line of credit, bank	500	500
Line of credit, related party	2,155	224
Current portion of long-term debt, related party	500	500
Current portion of finance lease obligations	177	218
Current portion of operating lease obligations	431	357
Accounts payable	2,126	1,748
Current portion of deferred revenue	411	482
Accrued expenses	484	380
Total current liabilities	6,784	4,409
Long-term portion of finance lease obligations	110	288
Long-term portion of operating lease obligations	1,651	2,035
Long-term convertible loan, related party	1,097	830
PPP Loan (SBA)	952
Long-term portion of deferred revenue		93
Asset retirement obligations	214	206
Total long-term liabilities	4,024	3,452
Contingent liabilities
Stockholders' equity:
Preferred stock, $.01 par value, 24,088 shares authorized, and no shares issued and outstanding
Common stock, $.01 par value, 55,000,000 shares authorized; 38,221,292 and 38,136,792 shares issued and outstanding on December 31, 2020 and December 31, 2019, respectively	382	381
Additional paid-in capital	102,117	101,886
Accumulated deficit	(99,767)	(100,756)
Total stockholders' equity	2,732	1,511
Total liabilities and stockholders' equity	$ 13,540	$ 9,372