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Note 4 - Debt - Interest Rate Margins (Details) - KeyBank [Member] - Revolving Credit Facility [Member]	12 Months Ended
	Dec. 31, 2018
Leverage Ratio Less Than 1.5 [Member]
Applicable basis points for unused fee	0.20%
Leverage Ratio Between 1.5 and 2.5 [Member]
Applicable basis points for unused fee	0.15%
Leverage Ratio Greater than 2.5 [Member]
Applicable basis points for unused fee	0.10%
London Interbank Offered Rate (LIBOR) [Member] | Leverage Ratio Less Than 1.5 [Member]
Interest rate margin on outstanding borrowings	1.85%
London Interbank Offered Rate (LIBOR) [Member] | Leverage Ratio Between 1.5 and 2.5 [Member]
Interest rate margin on outstanding borrowings	2.00%
London Interbank Offered Rate (LIBOR) [Member] | Leverage Ratio Greater than 2.5 [Member]
Interest rate margin on outstanding borrowings	2.15%
Base Rate [Member] | Leverage Ratio Less Than 1.5 [Member]
Interest rate margin on outstanding borrowings	(0.50%)
Base Rate [Member] | Leverage Ratio Between 1.5 and 2.5 [Member]
Interest rate margin on outstanding borrowings	(0.25%)
Base Rate [Member] | Leverage Ratio Greater than 2.5 [Member]
Interest rate margin on outstanding borrowings	0.00%

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=ulbi_KeybankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=ulbi_LeverageRatioLessThan15Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=ulbi_LeverageRatioBetween15And25Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=ulbi_LeverageRatioGreaterThan25Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: