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Note 5 - Debt (Details Narrative) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 24, 2013 | May 24, 2017 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Note 5 - Debt Details Narrative |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 20,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity |  |
Letter of credit facility |  |  | 1,000ulbi_LetterOfCreditMaximum |  |
Potential Credit Facility Increase (in Dollars) |  | 35,000ulbi_PotentialCreditFacilityMaximumBorrowingIncrease |  |  |
Line Of Credit, Maximum Borrowing Capacity, Percentage Of Eligible Accounts Receivable | 85.00%ulbi_LineOfCreditMaximumBorrowingCapacityPercentageOfEligibleAccountsReceivable |  |  |  |
Line Of Credit, Maximum Borrowing Capacity, Percentage Of Eligible Accounts Line Of Credit, Maximum Borrowing Capacity, Percentage Of Book Value Of Eligible Inventory | 65.00%ulbi_LineOfCreditMaximumBorrowingCapacityPercentageOfBookValueOfEligibleInventory |  |  |  |
Line Of Credit, Maximum Borrowing Capacity, Percentage Of Appraised Net Orderly Liquidation Value Of Eligible Inventory | 85.00%ulbi_LineOfCreditMaximumBorrowingCapacityPercentageOfAppraisedNetOrderlyLiquidationValueOfEligibleInventory |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  | 0.375%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage |  |
Line of Credit Facility, Amount Outstanding (in Dollars) |  |  | 0us-gaap_LineOfCreditFacilityAmountOutstanding |  |
Line of Credit Facility, Interest Rate at Period End |  |  | 2.17%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd |  |
Line of Credit Facility, Remaining Borrowing Capacity (in Dollars) |  |  | 12,628us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity |  |
Cash and Cash Equivalents, at Carrying Value (in Dollars) |  |  | $ 17,711us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 16,066us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 9,656us-gaap_CashAndCashEquivalentsAtCarryingValue
Minimum fixed charge coverage ratio |  |  | 115.00%ulbi_MinimumFixedChargeCoverageRatio |  |

X
- Definition No authoritative reference available. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line Of Credit, Maximum Borrowing Capacity, Percentage Of Appraised Net Orderly Liquidation Value Of Eligible Inventory + References No definition available. + Details
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Balance Type: | na
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X
- Definition Line Of Credit, Maximum Borrowing Capacity, Percentage Of Book Value Of Eligible Inventory + References No definition available. + Details
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Period Type: | duration

X
- Definition Line Of Credit, Maximum Borrowing Capacity, Percentage Of Eligible Accounts Receivable + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition No authoritative reference available. + References No definition available. + Details
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- Details
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- Definition No authoritative reference available. + References No definition available. + Details
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Namespace Prefix: | ulbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition The effective interest rate at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Balance Type: | credit
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Balance Type: | credit
Period Type: | instant

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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
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