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Note 11 - Business Segment Information - Segment Activity (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Revenues $ 43,371 $ 35,694 $ 142,678 $ 120,604
Cost of products sold (33,752) (27,012) (108,713) (88,889)
Gross profit 9,619 8,682 33,965 31,715
Operating Expenses 10,570 8,171 29,261 23,224
Research and development (2,855) (2,101) (7,577) (5,854)
Segment contribution (951) 511 4,704 8,491
Operating Income (951) 511 4,704 8,491
Other expenses, net (800) (158) (2,896) (685)
Income tax provision 504 (74) (306) (1,630)
Non-controlling interest 27 (21) 22 (58)
Net income attributable to Ultralife (1,220) 258 1,524 6,118
Operating Segments [Member]        
Operating Expenses (4,128) (3,331) (12,767) (10,092)
Segment contribution 2,636 3,250 13,621 15,769
Operating Income 2,636 3,250 13,621 15,769
Operating Segments [Member] | Battery & Energy Products Segment [Member]        
Revenues 39,946 32,529 132,134 104,201
Cost of products sold (31,126) (24,482) (101,039) (77,215)
Gross profit 8,820 8,047 31,095 26,986
Operating Expenses (3,689) (2,941) (11,578) (8,839)
Research and development (2,013) (1,322) (5,098) (3,583)
Segment contribution 3,118 3,784 14,419 14,564
Operating Income 3,118 3,784 14,419 14,564
Operating Segments [Member] | Communications Systems Segment [Member]        
Revenues 3,425 3,165 10,544 16,403
Cost of products sold (2,626) (2,530) (7,674) (11,674)
Gross profit 799 635 2,870 4,729
Operating Expenses (439) (390) (1,189) (1,253)
Research and development (842) (779) (2,479) (2,271)
Segment contribution (482) (534) (798) 1,205
Operating Income (482) (534) (798) 1,205
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]        
Revenues 0 0 0 0
Cost of products sold 0 0 0 0
Gross profit 0 0 0 0
Operating Expenses (3,587) (2,739) (8,917) (7,278)
Research and development 0 0 0 0
Other expenses, net (800) (158) (2,896) (685)
Income tax provision 504 (74) (306) (1,630)
Non-controlling interest $ 27 $ (21) $ 22 $ (58)