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Note 7 - Revolving Credit Agreement (Details Narrative) (USD $)
 3 Months Ended 6 Months Ended
Mar. 29, 2015
May 24, 2017
Dec. 31, 2014
Mar. 30, 2014
Dec. 31, 2013
Note 7 - Revolving Credit Agreement Details Narrative          
Line of Credit Facility, Maximum Borrowing Capacity $ 20,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity        
Letter of credit sub-facility 1,000,000ULBI_LineOfCreditFacilityLetterOfCreditBorrowingCapacity        
Line of Credit Maximum Borrowing Capacity may be increased in the last six months of the term   35,000,000ULBI_LineOfCreditFacilityMaximumBorrowingCapacityMayBeIncreasedTo      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.375%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage        
Line of Credit Facility, Amount Outstanding 0us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding        
Line of Credit Facility, Remaining Borrowing Capacity 11,067,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity        
Unrestricted Cash on hand $ 20,133,000us-gaap_CashAndCashEquivalentsAtCarryingValue   $ 17,711,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 18,744,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 16,066,000us-gaap_CashAndCashEquivalentsAtCarryingValue