CONSOLIDATED BALANCE SHEETS (Unaudited Consolidated Condensed) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash	$ 1,819	$ 957
Trade accounts receivable, less allowance for doubtful accounts of $9 for both March 31, 2021 and December 31, 2020	3,828	2,932
Inventories, net	5,001	4,340
Prepaid expenses and other current assets	653	606
Total current assets	11,301	8,835
Equipment and leasehold improvements, net	3,004	2,868
Operating leases, right of use	1,886	1,827
Other assets, net	10	10
Total assets	16,201	13,540
Current liabilities:
Line of credit, bank	500	500
Line of credit, related party	3,365	2,155
Current portion of long-term debt, related party	500	500
Current portion of finance lease obligations	168	177
Current portion of operating lease obligations	477	431
Accounts payable	2,448	2,126
Deferred revenue	495	411
Accrued expenses	1,055	484
Total current liabilities	9,008	6,784
Long-term portion of finance lease obligations	73	110
Long-term portion of operating lease obligations	1,656	1,651
Long-term convertible loan, related party	1,164	1,097
PPP Loan (SBA)		952
Asset retirement obligations	216	214
Total long-term liabilities	3,109	4,024
Contingent liabilities
Shareholders' 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 shares issued and outstanding on March 31, 2021 and December 31, 2020, respectively	382	382
Additional paid-in capital	102,159	102,117
Accumulated deficit	(98,457)	(99,767)
Total Shareholders' equity	4,084	2,732
Total liabilities and stockholders' equity	$ 16,201	$ 13,540