Note 11 - Business Segment Information - Segment Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenues	$ 30,373	$ 25,973
Segment contribution	(295)	952
Other expense	(117)	(56)
Tax benefit	251	(217)
Non-controlling interest	(7)	(8)
Net loss attributable to Ultralife	(168)	671
Battery & Energy Products Segment [Member]
Revenues	29,150	22,111
Segment contribution	6,721	5,436
Communications Systems Segment [Member]
Revenues	1,223	3,862
Segment contribution	237	1,542
Corporate Segment [Member]
Segment contribution	(7,253)	(6,026)
Other expense	(117)	(56)
Tax benefit	251	(217)
Non-controlling interest	$ (7)	$ (8)