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Note 1 - Summary of Operations and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2012
Allowance for Credit Losses on Financing Receivables [Table Text Block] |
|  | 2012 |  |  | 2011 |
Balance at beginning of year |  | $ | 683 |  |  | $ | 490 |
Amounts charged (credited) to expense |  |  | 9 |  |  |  | 237 |
Amounts credited to other accounts |  |  | - |  |  |  | (2 | )
Uncollectible accounts written-off, net of recovery |  |  | (370 | ) |  |  | (42 | )
Balance at end of year |  | $ | 322 |  |  | $ | 683 |
Property, Plant and Equipment, Estimated Useful Lives |
| Buildings | 10 – 20 years
| Machinery and Equipment | 5 – 10 years
| Furniture and Fixtures | 3 – 10 years
| Computer Hardware and Software | 3 – 5 years
| Leasehold Improvements | Lesser of useful life or lease term
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Years Ended December 31, |
|  | 2012 |  |  | 2011 |
Net Income (Loss) from continuing operations attributable to Ultralife |  | $ | (1,097 | ) |  | $ | 1,607 |
Net Income (Loss) from continuing operations attributable to participating securities (unvested restricted stock awards) (-0- and 3,000 shares, respectively) |  |  | - |  |  |  | - |
Net Income (Loss) from continuing operations attributable to Ultralife common shareholders (a) |  |  | (1,097 | ) |  |  | 1,607 |
Net Income (Loss) from discontinued operations attributable to Ultralife common shareholders (c) |  | $ | (501 | ) |  | $ | (3,687 | )
Average Common Shares Outstanding – Basic (e) |  |  | 17,403 |  |  |  | 17,304 |
Effect of Dilutive Securities: |  |  |  |  |  |  |  |
Stock Options / Warrants |  |  | - |  |  |  | 32 |
Average Common Shares Outstanding – Diluted (f) |  |  | 17,403 |  |  |  | 17,336 |
EPS – Basic (a/e) – continuing operations |  | $ | (0.06 | ) |  | $ | 0.09 |
EPS – Basic (c/e) – discontinued operations |  | $ | (0.03 | ) |  | $ | (0.21 | )
EPS – Diluted (b/f) – continuing operations |  | $ | (0.06 | ) |  | $ | 0.09 |
EPS – Diluted (d/f) – discontinued operations |  | $ | (0.03 | ) |  | $ | (0.21 | )

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- Definition Tabular disclosure of financing receivables (examples of financing receivables include loans, trade accounts receivable and notes receivable) and activity in the allowance for credit losses account. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2155824 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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