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Note 7 - Shareholders' Equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 13 Months Ended 1 Months Ended
Jan. 03, 2011
Mar. 07, 2008
Dec. 30, 2011
May 01, 2015
Dec. 31, 2014
Dec. 31, 2013
Jan. 29, 2013
Jan. 29, 2014
Dec. 30, 2010
Jun. 02, 2014
Dec. 31, 2012
Jun. 30, 2004
Note 7 - Shareholders' Equity (Details) [Line Items]                        
Preferred Stock, Shares Authorized         10,000,000us-gaap_PreferredStockSharesAuthorized 10,000,000us-gaap_PreferredStockSharesAuthorized            
Preferred Stock, Par or Stated Value Per Share (in Dollars per share)         $ 0.1us-gaap_PreferredStockParOrStatedValuePerShare $ 0.1us-gaap_PreferredStockParOrStatedValuePerShare            
Preferred Stock, Shares Issued         0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued            
Preferred Stock, Shares Outstanding         0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding            
Common Stock, Shares Authorized         40,000,000us-gaap_CommonStockSharesAuthorized 40,000,000us-gaap_CommonStockSharesAuthorized            
Common Stock, Par or Stated Value Per Share (in Dollars per share)         $ 0.1us-gaap_CommonStockParOrStatedValuePerShare $ 0.1us-gaap_CommonStockParOrStatedValuePerShare            
Stock Issued During Period, Shares, Issued for Services         56,898us-gaap_StockIssuedDuringPeriodSharesIssuedForServices 19,845us-gaap_StockIssuedDuringPeriodSharesIssuedForServices            
Stock Issued During Period, Value, Issued for Services (in Dollars)         $ 210us-gaap_StockIssuedDuringPeriodValueIssuedForServices $ 73us-gaap_StockIssuedDuringPeriodValueIssuedForServices            
Treasury Stock, Shares         1,600,731us-gaap_TreasuryStockShares 1,372,757us-gaap_TreasuryStockShares            
Treasury Stock, Value (in Dollars)         8,420us-gaap_TreasuryStockValue 7,658us-gaap_TreasuryStockValue            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                   1,750,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years                      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized for Grants other than Options                   800,000ulbi_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedOtherThanOptions    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number         2,056,122us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 2,131,622us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber       0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 2,211,488us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 50,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 50,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross     3.94us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 3.60us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (2004 LTIP)         2,006,122ulbi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber04LTIP              
Share Price (in Dollars per share) $ 6.58us-gaap_SharePrice $ 12.74us-gaap_SharePrice                    
Share Based Payment Award, Options, Annual Incremental Vesting 12,500ulbi_ShareBasedPaymentAwardOptionsAnnualIncrementalVesting                      
Share Based Payment Award, Options, Term     5 years                  
Share-based Compensation (in Dollars)         1,003us-gaap_ShareBasedCompensation 1,131us-gaap_ShareBasedCompensation            
Share-based compensation relating to options         614us-gaap_StockOptionPlanExpense 774us-gaap_StockOptionPlanExpense            
Share-based compensation relating to restricted stock units - CEO         150ulbi_RestrictedStockExpenseCEO 284ulbi_RestrictedStockExpenseCEO            
Share-based compensation relating to restricted stock units - others         29ulbi_RestrictedStockExpenseOthers              
Grant date fair value of restricted stock units awarded         $ 3.24ulbi_ShareBasedCompensationRestrictedStockUnitsAwardedGrantDateFairValuePerShare              
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars)         381us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized              
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition         1 year 146 days              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)         $ 1.6us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 1.7us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value (in Dollars)         3us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 1us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue            
Proceeds from Stock Options Exercised (in Dollars)         11us-gaap_ProceedsFromStockOptionsExercised 12us-gaap_ProceedsFromStockOptionsExercised            
Stock repurchase plan - shares authorized to be repurchased       1,800,000ulbi_StockRepurchasePlanSharesAuthorizedToBeRepurchased                
Total shares repurchased         227,974ulbi_TreasuryStockSharesRepurchased 0ulbi_TreasuryStockSharesRepurchased            
Cost of shares repurchased         762us-gaap_TreasuryStockValueAcquiredCostMethod 0us-gaap_TreasuryStockValueAcquiredCostMethod            
Shares repurchased under share repurchase plan         216,754ulbi_TreasuryStockSharesRepurchasedUnderShareRepurchasePlan              
Shares repurchased under share repurchase plan - value         722ulbi_TreasuryStockValueAcquiredCostMethodUnderShareRepurchasePlan              
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars)         $ 130ulbi_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedRestrictedStock              
Shares of common stock reserved for issuance under all plans         3,879,104us-gaap_CommonStockCapitalSharesReservedForFutureIssuance              
Long Term Incentive Plan [Member]                        
Note 7 - Shareholders' Equity (Details) [Line Items]                        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                       750,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= ulbi_LongTermIncentivePlanMember
Contingent Restricted Stock Units [Member] | President And Chief Executive Officer [Member]                        
Note 7 - Shareholders' Equity (Details) [Line Items]                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross             120,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= ulbi_ContingentRestrictedStockUnitsMember
/ us-gaap_TitleOfIndividualAxis
= ulbi_PresidentAndChiefExecutiveOfficerMember		          
Option Grant 2 [Member]                        
Note 7 - Shareholders' Equity (Details) [Line Items]                        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     4 years                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     250,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ ulbi_EmploymentAgreementAxis
= ulbi_OptionGrant2Member		                  
Share Price (in Dollars per share)     6.42us-gaap_SharePrice
/ ulbi_EmploymentAgreementAxis
= ulbi_OptionGrant2Member		         $ 5.00us-gaap_SharePrice
/ ulbi_EmploymentAgreementAxis
= ulbi_OptionGrant2Member		        
Share Based Payment Award, Options, Annual Incremental Vesting     62,500ulbi_ShareBasedPaymentAwardOptionsAnnualIncrementalVesting
/ ulbi_EmploymentAgreementAxis
= ulbi_OptionGrant2Member		         30,000ulbi_ShareBasedPaymentAwardOptionsAnnualIncrementalVesting
/ ulbi_EmploymentAgreementAxis
= ulbi_OptionGrant2Member		        
Number of days in period minimum share price requirement             15 days          
Number Of Days In Period, Minimum Share Price Requirement, Term             30 days          
Option Grant 4 [Member]                        
Note 7 - Shareholders' Equity (Details) [Line Items]                        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     4 years                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ ulbi_EmploymentAgreementAxis
= ulbi_OptionGrant4Member		                  
Share Price (in Dollars per share)             5.00us-gaap_SharePrice
/ ulbi_EmploymentAgreementAxis
= ulbi_OptionGrant4Member		   $ 15.00us-gaap_SharePrice
/ ulbi_EmploymentAgreementAxis
= ulbi_OptionGrant4Member		      
Share Based Payment Award, Options, Annual Incremental Vesting     50,000ulbi_ShareBasedPaymentAwardOptionsAnnualIncrementalVesting
/ ulbi_EmploymentAgreementAxis
= ulbi_OptionGrant4Member		       30,000ulbi_ShareBasedPaymentAwardOptionsAnnualIncrementalVesting
/ ulbi_EmploymentAgreementAxis
= ulbi_OptionGrant4Member		          
Minimum Share Price Requirement (in Dollars per share)                 $ 15.00ulbi_MinimumSharePriceRequirement
/ ulbi_EmploymentAgreementAxis
= ulbi_OptionGrant4Member		      
Number of days in period minimum share price requirement     15 days       15 days          
Number Of Days In Period, Minimum Share Price Requirement, Term     30 days       30 days          
Option Grant 3 [Member]                        
Note 7 - Shareholders' Equity (Details) [Line Items]                        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     4 years                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ ulbi_EmploymentAgreementAxis
= ulbi_OptionGrant3Member		                  
Share Price (in Dollars per share)     10.00us-gaap_SharePrice
/ ulbi_EmploymentAgreementAxis
= ulbi_OptionGrant3Member		       4.00us-gaap_SharePrice
/ ulbi_EmploymentAgreementAxis
= ulbi_OptionGrant3Member		          
Share Based Payment Award, Options, Annual Incremental Vesting     50,000ulbi_ShareBasedPaymentAwardOptionsAnnualIncrementalVesting
/ ulbi_EmploymentAgreementAxis
= ulbi_OptionGrant3Member		       30,000ulbi_ShareBasedPaymentAwardOptionsAnnualIncrementalVesting
/ ulbi_EmploymentAgreementAxis
= ulbi_OptionGrant3Member		          
Minimum Share Price Requirement (in Dollars per share)     10.00ulbi_MinimumSharePriceRequirement
/ ulbi_EmploymentAgreementAxis
= ulbi_OptionGrant3Member		                  
Number of days in period minimum share price requirement     15 days       15 days          
Number Of Days In Period, Minimum Share Price Requirement, Term     30 days       30 days          
Option Grant 1 [Member]                        
Note 7 - Shareholders' Equity (Details) [Line Items]                        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period                 4 years      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                 50,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ ulbi_EmploymentAgreementAxis
= ulbi_OptionGrant1Member		      
Share Price (in Dollars per share)             4.00us-gaap_SharePrice
/ ulbi_EmploymentAgreementAxis
= ulbi_OptionGrant1Member		   $ 6.42us-gaap_SharePrice
/ ulbi_EmploymentAgreementAxis
= ulbi_OptionGrant1Member		      
Share Based Payment Award, Options, Annual Incremental Vesting             30,000ulbi_ShareBasedPaymentAwardOptionsAnnualIncrementalVesting
/ ulbi_EmploymentAgreementAxis
= ulbi_OptionGrant1Member		   12,500ulbi_ShareBasedPaymentAwardOptionsAnnualIncrementalVesting
/ ulbi_EmploymentAgreementAxis
= ulbi_OptionGrant1Member		      
Number of days in period minimum share price requirement               15 days        
Number Of Days In Period, Minimum Share Price Requirement, Term               30 days