Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 3,179	$ 3,955
Short-term investments	5,000	7,500
Accounts receivable and contract assets, net	2,347	3,025
Inventories, net	6,366	5,794
Prepaid expense and other current assets	825	953
Total current assets	17,717	21,227
Property and equipment, net	408	509
Operating lease right-of-use asset, net	2,185	2,256
Intangible assets, net	2,608	2,648
Goodwill	1,610	1,610
Other assets	244	251
Total assets	24,772	28,501
Current liabilities:
Accounts payable	1,092	1,110
Accrued liabilities	835	692
Customer deposits	20	1,002
Deferred revenue - short term	363	407
Operating lease liability - short term	619	616
Warrants	15,524	19,703
Total current liabilities	18,453	23,530
Long-term liabilities:
Deferred revenue - long term	128	137
Operating lease liability - long term	1,708	1,671
Total long-term liabilities	1,836	1,808
Total liabilities	20,289	25,338
Commitments and Contingencies
Stockholders' equity:
Common stock - 150,000,000 authorized; par value $0.0001 per share; 44,373,107 and 41,270,300 shares issued and outstanding at March 31, 2024 and December 31, 2023, respectively	4	4
Additional paid-in capital	100,544	99,131
Accumulated deficit	(98,060)	(97,988)
Total stockholders' equity	4,483	3,163
Total liabilities and stockholders' equity	24,772	28,501
Undesignated [Member]
Stockholders' equity:
Preferred stock	0	0
Convertible Preferred Stock [Member]
Stockholders' equity:
Preferred stock	$ 1,995	$ 2,016