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Note 6 - Debt - Interest Rate Margins (Details)	12 Months Ended
	Dec. 31, 2016
Greater than $8 Million [Member] | Base Rate [Member]
Interest Rate Margin on Outstanding Borrowings	1.00%
Greater than $8 Million [Member] | London Interbank Offered Rate (LIBOR) [Member]
Interest Rate Margin on Outstanding Borrowings	2.00%
$5 to $8 Million [Member] | Base Rate [Member]
Interest Rate Margin on Outstanding Borrowings	1.25%
$5 to $8 Million [Member] | London Interbank Offered Rate (LIBOR) [Member]
Interest Rate Margin on Outstanding Borrowings	2.25%
Less than $5 Million [Member] | Base Rate [Member]
Interest Rate Margin on Outstanding Borrowings	1.50%
Less than $5 Million [Member] | London Interbank Offered Rate (LIBOR) [Member]
Interest Rate Margin on Outstanding Borrowings	2.50%

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

- Details

Name:	us-gaap_DebtInstrumentAxis=ulbi_GreaterThan8MillionMember
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:

X

- Details

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

X

- Details

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

X

- Details

Name:	us-gaap_DebtInstrumentAxis=ulbi_LessThan5MillionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: