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Note 6 - Debt (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Interest Rate Margins on Outstanding Debt [Table Text Block] |
Quarterly Average Undrawn Borrowing Availability |  | Applicable Margin for Alternate Base Rate Loans |  |  | Applicable Margin for LIBOR Rate Loans |
Greater than $8,000,000 |  |  | 1.00% |  |  |  | 2.00% |
$5,000,000 up to $8,000,000 |  |  | 1.25% |  |  |  | 2.25% |
Less than $5,000,000 |  |  | 1.50% |  |  |  | 2.50% |

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- Definition Tabular disclosure of interest rate margins on outstanding debt. + References No definition available. + Details
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Namespace Prefix: | ulbi_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration