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Note 12 - Geographic and Segment Information - Reportable Segments (Details) - USD ($)
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Sales $ 9,430,000 $ 10,244,000
Cost of sales 3,765,000 4,295,000
Gross profit 5,665,000 5,949,000
Commissions 839,000 717,000
All other expenses(i) [1] 7,877,000 11,847,000
Income (loss) from operations (3,051,000) (6,615,000)
Interest income 304,000 495,000
Interest expense (1,376,000) (1,396,000)
Income (loss) before income taxes (4,123,000) (7,537,000)
Income Tax Expense (Benefit) 49,000 53,000
Net income (loss) (4,172,000) (7,590,000)
Other loss, net   (21,000)
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] 3,158,000 4,407,000
Income (loss) from operations (3,158,000) (4,407,000)
Interest income 304,000 495,000
Interest expense (1,376,000) (1,396,000)
Income (loss) before income taxes (4,230,000) (5,329,000)
Income Tax Expense (Benefit) 49,000 53,000
Net income (loss) (4,279,000) (5,382,000)
Other loss, net   (21,000)
Advanced Energy [Member] | Operating Segments [Member]    
Sales 7,887,000 7,453,000
Cost of sales 2,320,000 2,262,000
Gross profit 5,567,000 5,191,000
Commissions 839,000 717,000
All other expenses(i) [1] 4,713,000 7,414,000
Income (loss) from operations 15,000 (2,940,000)
Interest income 0 0
Interest expense 0 0
Income (loss) before income taxes 15,000 (2,940,000)
Income Tax Expense (Benefit) 0 0
Net income (loss) 15,000 (2,940,000)
Other loss, net   0
OEM [Member] | Operating Segments [Member]    
Sales 1,543,000 2,791,000
Cost of sales 1,445,000 2,033,000
Gross profit 98,000 758,000
Commissions 0 0
All other expenses(i) [1] 6,000 26,000
Income (loss) from operations 92,000 732,000
Interest income 0 0
Interest expense 0 0
Income (loss) before income taxes 92,000 732,000
Income Tax Expense (Benefit) 0 0
Net income (loss) $ 92,000 732,000
Other loss, net   $ 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.