Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash	$ 488	$ 866
Accounts receivable, net	1,768	1,368
Inventories, net	5,634	5,005
Prepaid expenses and other current assets	896	755
Total current assets	8,786	7,994
Non-current assets:
Property, plant and equipment, net	331	431
Right-of-use asset, net	540	755
Other assets	82	68
Total non-current assets	953	1,254
TOTAL ASSETS	9,739	9,248
Current liabilities:
Accounts payable and accrued expenses	4,042	4,068
Note payable	1,000	0
Derivative liability	547	899
Lease liabilities	222	329
Deferred revenue	203	238
Total current liabilities	6,014	5,534
Non-current liabilities:
Notes payable, net of current portion	150	150
Lease liabilities, net of current portion	318	433
Total non-current liabilities	468	583
Total liabilities	6,482	6,117
COMMITMENTS AND CONTINGENCIES (see Note 12)
Stockholders' equity:
Common stock ($0.001 par value); 500,000,000 shares authorized; 217,726,053 and 210,890,930 shares issued and outstanding as of June 30, 2022 and December 31, 2021, respectively	218	211
Additional paid-in capital	7,824	7,775
Accumulated deficit	(4,785)	(4,855)
Total stockholders' equity	3,257	3,131
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	9,739	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