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Note 6 - Debt (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Interest Rate Margins on Outstanding Debt [Table Text Block] |
| Consolidated Senior Leverage Ratio |  | Applicable Basis Points for Overnight LIBOR Loans |  |  | Applicable Basis Points for Base Rate Loans |  |  | Applicable Basis Points for Unused Fee |
| Less than 1.50 to 1.00 |  |  | 185 |  |  |  | (50) |  |  |  | 20 |
| Greater than or equal to 1.50 to 1.00 but less than 2.50 to 1.00 |  |  | 200 |  |  |  | (25) |  |  |  | 15 |
| Greater than or equal to 2.50 to 1.00 |  |  | 215 |  |  |  | 0 |  |  |  | 10 |

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