Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash	$ 409	$ 866
Accounts receivable, net	1,717	1,368
Inventories, net	4,696	5,005
Prepaid expenses and other current assets	1,226	755
Total current assets	8,048	7,994
Non-current assets:
Property, plant and equipment, net	449	431
Right-of-use asset, net	638	755
Other assets	70	68
Total non-current assets	1,157	1,254
TOTAL ASSETS	9,205	9,248
Current liabilities:
Accounts payable and accrued expenses	3,684	4,068
Derivative liability	559	899
Lease liabilities	265	329
Deferred revenue	316	238
Total current liabilities	4,824	5,534
Non-current liabilities:
Notes payable, net of current portion	150	150
Lease liabilities, net of current portion	376	433
Total non-current liabilities	526	583
Total liabilities	5,350	6,117
COMMITMENTS AND CONTINGENCIES (see Note 12)
Stockholders' equity:
Common stock ($0.001 par value); 500,000,000 shares authorized; 216,840,987 and 210,890,930 shares issued and outstanding as of March 31, 2022 and December 31, 2021, respectively	217	211
Additional paid-in capital	7,787	7,775
Accumulated deficit	(4,149)	(4,855)
Total stockholders' equity	3,855	3,131
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	9,205	9,248
Series A Preferred Stock [Member]
Stockholders' equity:
Convertible preferred stock	0	0
Series B Preferred Stock [Member]
Stockholders' equity:
Convertible preferred stock	$ 0	$ 0