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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