Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Cash Flows From Operating Activities:
Net loss for the period	$ 117	$ (4,028)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	223	200
Share-based compensation	675	628
Warranty provision	21	(33)
Change in fair value of warranty liabilities	(4,179)	(0)
Non-cash lease expense	71	26
Provision for doubtful accounts	0	(8)
Inventory obsolescence reserve	12	0
Changes in assets and liabilities:
Accounts receivable	683	1,687
Inventories	(584)	(1,652)
Prepaid expenses and other current assets	129	(83)
Accounts payable	(19)	(42)
Operating lease liability	39	(26)
Customer deposits	(982)	1
Accrued liabilities and other	164	306
Warranty settlement	(42)	(1)
Deferred Revenue	(52)	(42)
Net cash used in operating activities	(3,724)	(3,067)
Cash Flows From Investing Activities:
Purchase of short-term investments	0	(2,645)
Proceeds from maturities of short-term investments	2,500	10,000
Capital expenditures for property and equipment	(14)	(15)
Proceeds from long-term deposits	0	31
Net cash provided by investing activities	2,420	7,240
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from exercise of stock options	588	0
Dividends settled in Cash	(60)	0
Net cash provided by financing activities	528	0
Net (decrease) increase in cash and cash equivalents	(776)	4,173
Cash and cash equivalents, beginning of period	3,955	5,330	$ 5,330
Cash and cash equivalents, end of period	3,179	9,503	$ 3,955
us-gaap_SupplementalCashFlowElementsAbstract
Change in unrealized gain on short-term investments		(94)
Dividends on convertible preferred stock	189	0
Dividends settled with common stock	129	0
Patents and Trademarks [Member]
Cash Flows From Investing Activities:
Investment in patents and trademarks	$ (66)	$ (131)