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Note 4 - Debt - Interest Rate Margins (Details) - KeyBank [Member] - Revolving Credit Facility [Member] | 12 Months Ended
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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%

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- 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

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- 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

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

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

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

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

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

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- 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: |