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Note 10 - Business Segment Information - Segment Activity (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues	[1]	$ 26,770	$ 28,560	$ 52,743	$ 54,374
Segment contribution		1,091	2,294	2,043	3,779
Other expense		(21)	(117)	(77)	(209)
Income tax provision		(248)	(499)	(465)	(818)
Non-controlling interest		(11)	(20)	(19)	(35)
Net income attributable to Ultralife		811	1,658	1,482	2,717
Battery & Energy Products Segment [Member]
Revenues	[1]	22,875	24,036	44,986	44,797
Segment contribution		6,016	6,026	11,452	11,342
Communications Systems Segment [Member]
Revenues	[1]	3,895	4,524	7,757	9,577
Segment contribution		1,251	1,937	2,793	3,955
Corporate Segment [Member]
Revenues		0	0	0	0
Segment contribution		(6,176)	(5,669)	(12,202)	(11,518)
Other expense		(21)	(117)	(77)	(209)
Income tax provision		(248)	(499)	(465)	(818)
Non-controlling interest		$ (11)	$ (20)	$ (19)	$ (35)
[1] Sales classified to U.S. include shipments to U.S.-based prime contractors which in some cases may serve non-U.S. projects.

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