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Note 3 - Supplemental Balance Sheet Information - Goodwill Activity by Segment (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Goodwill - beginning $ 16,419us-gaap_Goodwill $ 16,344us-gaap_Goodwill
Effect of foreign currency translation (12)us-gaap_GoodwillTranslationAdjustments 75us-gaap_GoodwillTranslationAdjustments
Goodwill - ending 16,407us-gaap_Goodwill 16,419us-gaap_Goodwill
Battery [Member]    
Goodwill - beginning 4,926us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ulbi_BatteryMember		 4,851us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ulbi_BatteryMember
Effect of foreign currency translation (142)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= ulbi_BatteryMember		 75us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= ulbi_BatteryMember
Goodwill - ending 4,914us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ulbi_BatteryMember		 4,926us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ulbi_BatteryMember
Communications Systems    
Goodwill - beginning 11,493us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ulbi_CommsMember		 11,493us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ulbi_CommsMember
Effect of foreign currency translation 0us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= ulbi_CommsMember		 0us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= ulbi_CommsMember
Goodwill - ending $ 11,493us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ulbi_CommsMember		 $ 11,493us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= ulbi_CommsMember