v3.26.1
Note 10 - Business Segment Information - Segment Activity (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Revenues $ 47,445 $ 50,746  
Cost of products sold (37,335) (38,001)  
Gross profit 10,110 12,745  
Operating Expenses 10,325 9,346  
Research and development (2,961) (2,404)  
Segment contribution (215) 3,399  
Operating Income (215) 3,399  
Other expenses, net (448) (953)  
Income tax (benefit) provision (192) 567  
Net (loss) income attributable to non-controlling interest (20) 14  
Net income attributable to Ultralife (451) 1,865  
Total assets 220,632 223,753 $ 216,912
Depreciation and amortization of intangible assets 1,321 1,356  
Battery & Energy Products Segment [Member]      
Operating Expenses (4,460)    
Operating Segments [Member]      
Operating Expenses   (4,231)  
Segment contribution 2,689 6,110  
Operating Income 2,689 6,110  
Operating Segments [Member] | Battery & Energy Products Segment [Member]      
Revenues 44,155 46,321  
Cost of products sold (34,797) (34,881)  
Gross profit 9,358 11,440  
Operating Expenses (4,081) (3,865)  
Research and development (2,222) (1,591)  
Segment contribution 3,055 5,984  
Operating Income 3,055 5,984  
Total assets 169,847 173,169  
Depreciation and amortization of intangible assets 1,222 1,265  
Operating Segments [Member] | Communications Systems Segment [Member]      
Revenues 3,290 4,425  
Cost of products sold (2,538) (3,120)  
Gross profit 752 1,305  
Operating Expenses (379) (366)  
Research and development (739) (813)  
Segment contribution (366) 126  
Operating Income (366) 126  
Total assets 27,322 30,006  
Depreciation and amortization of intangible assets 57 58  
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]      
Revenues 0 0  
Cost of products sold 0 0  
Gross profit 0 0  
Research and development 0 0  
Other expenses, net (448) (953)  
Income tax (benefit) provision (192) 567  
Net (loss) income attributable to non-controlling interest (20) 14  
Total assets 23,463 20,578  
Depreciation and amortization of intangible assets $ 42 $ 33