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Note 5 - Debt - Interest Rate Margins (Details)
Dec. 31, 2014
Greater than $8 million | Alternate Base Rate Loans  
Interest Rate Margin on Outstanding Borrowings 1.00%ulbi_DebtInstrumentInterestRateMargin
/ ulbi_ApplicableMarginAxis
= ulbi_GreaterThanEightMillionMember
/ ulbi_QuarterlyUndrawnBorrowingAvailabilityAxis
= ulbi_AltBaseRateLoansMember
Greater than $8 million | LIBOR Rate Loans  
Interest Rate Margin on Outstanding Borrowings 2.00%ulbi_DebtInstrumentInterestRateMargin
/ ulbi_ApplicableMarginAxis
= ulbi_GreaterThanEightMillionMember
/ ulbi_QuarterlyUndrawnBorrowingAvailabilityAxis
= ulbi_LIBORRateLoansMember
$5-$8million | Alternate Base Rate Loans  
Interest Rate Margin on Outstanding Borrowings 1.25%ulbi_DebtInstrumentInterestRateMargin
/ ulbi_ApplicableMarginAxis
= ulbi_FiveToEightMillionMember
/ ulbi_QuarterlyUndrawnBorrowingAvailabilityAxis
= ulbi_AltBaseRateLoansMember
$5-$8million | LIBOR Rate Loans  
Interest Rate Margin on Outstanding Borrowings 2.25%ulbi_DebtInstrumentInterestRateMargin
/ ulbi_ApplicableMarginAxis
= ulbi_FiveToEightMillionMember
/ ulbi_QuarterlyUndrawnBorrowingAvailabilityAxis
= ulbi_LIBORRateLoansMember
Less than $5 million | Alternate Base Rate Loans  
Interest Rate Margin on Outstanding Borrowings 1.50%ulbi_DebtInstrumentInterestRateMargin
/ ulbi_ApplicableMarginAxis
= ulbi_LessThanFiveMillionMember
/ ulbi_QuarterlyUndrawnBorrowingAvailabilityAxis
= ulbi_AltBaseRateLoansMember
Less than $5 million | LIBOR Rate Loans  
Interest Rate Margin on Outstanding Borrowings 2.50%ulbi_DebtInstrumentInterestRateMargin
/ ulbi_ApplicableMarginAxis
= ulbi_LessThanFiveMillionMember
/ ulbi_QuarterlyUndrawnBorrowingAvailabilityAxis
= ulbi_LIBORRateLoansMember