Note 20 - Geographic and Segment Information - Reportable Segments (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023
Sales		$ 48,102	$ 52,349
Cost of sales		18,742	18,590
Gross profit		29,360	33,759
Commissions		4,546	6,515
All other expenses(i)	[1]	43,659	47,195
Operating Income (Loss)		(18,845)	(17,259)
Interest income		1,606	921
Interest expense		(5,907)	(2,478)
Other loss, net		(161)	622
(Loss) income before income taxes		(23,307)	(21,282)
Income tax expense		252	(2,432)
Net (loss) income		(23,559)	(18,850)
Gain on sale-leaseback		0	(2,692)
Loss on extinguishment of debt		0	(3,088)
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Sales		0	0
Cost of sales		0	0
Gross profit		0	0
Commissions		0	0
All other expenses(i)	[1]	16,929	21,519
Operating Income (Loss)		(16,929)	(18,827)
Interest income		1,606	921
Interest expense		(5,907)	(2,478)
Other loss, net		(161)	622
(Loss) income before income taxes		(21,391)	(22,850)
Income tax expense		252	(2,432)
Net (loss) income		(21,643)	(20,418)
Gain on sale-leaseback			(2,692)
Loss on extinguishment of debt			(3,088)
Advanced Energy [Member] | Operating Segments [Member]
Sales		38,606	43,382
Cost of sales		11,259	12,166
Gross profit		27,347	31,216
Commissions		4,546	6,515
All other expenses(i)	[1]	26,690	25,657
Operating Income (Loss)		(3,889)	(956)
Interest income		0	0
Interest expense		0	0
Other loss, net		0	0
(Loss) income before income taxes		(3,889)	(956)
Income tax expense		0
Net (loss) income		(3,889)	(956)
Gain on sale-leaseback			0
Loss on extinguishment of debt			0
OEM [Member] | Operating Segments [Member]
Sales		9,496	8,967
Cost of sales		7,483	6,424
Gross profit		2,013	2,543
Commissions		0	0
All other expenses(i)	[1]	40	19
Operating Income (Loss)		1,973	2,524
Interest income		0	0
Interest expense		0	0
Other loss, net		0	0
(Loss) income before income taxes		1,973	2,524
Income tax expense		0
Net (loss) income		$ 1,973	2,524
Gain on sale-leaseback			0
Loss on extinguishment of debt			$ 0

[1] For the Advanced Energy segment, all other expenses includes salaries and related costs, research and development, professional services, including marketing and physician consulting, and other selling, general, and administrative expenses such as travel and entertainment, advertising, trade show fees and meeting and training costs. For the OEM segment, substantially all related expenses are recorded as cost of sales, therefore no significant segment specific operating expenses are incurred. For Corporate & Other, all other expenses includes salaries and related costs, professional services, including legal, accounting and audit fees, investor relations consulting, information technology consulting, board of directors’ stock compensation expense, and general and administrative expenses, such as insurance, building lease costs, depreciation and computer software.