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Note 1 - Summary of Operations and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2013
Accounting Policies [Abstract] |
Allowance for Credit Losses on Financing Receivables [Table Text Block] |
|  | 2013 |  |  | 2012 |
Balance at beginning of year |  | $ | 322 |  |  | $ | 683 |
Amounts charged to expense |  |  | 29 |  |  |  | 9 |
Uncollectible accounts written-off, net of recovery |  |  | (63 | ) |  |  | (370 | )
Balance at end of year |  | $ | 288 |  |  | $ | 322 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Years Ended December 31, |
|  | 2013 |  |  | 2012 |
Net Loss from continuing operations attributable to Ultralife |  | $ | (1,054 | ) |  | $ | (1,097 | )
Net Loss from continuing operations attributable to participating securities (unvested restricted stock awards) (120,000 and -0- shares, respectively) |  |  | - |  |  |  | - |
Net Loss from continuing operations attributable to Ultralife common shareholders (a) |  |  | (1,054 | ) |  |  | (1,097 | )
Net Income (Loss) from discontinued operations attributable to Ultralife common shareholders (c) |  | $ | 128 |  |  | $ | (501 | )
Average Common Shares Outstanding – Basic (e) |  |  | 17,465,000 |  |  |  | 17,403,000 |
Effect of Dilutive Securities: |  |  |  |  |  |  |  |
Stock Options / Warrants |  |  | - |  |  |  | - |
Average Common Shares Outstanding – Diluted (f) |  |  | 17,465,000 |  |  |  | 17,403,000 |
EPS – Basic (a/e) – continuing operations |  | $ | (0.06 | ) |  | $ | (0.06 | )
EPS – Basic (c/e) – discontinued operations |  | $ | 0.01 |  |  | $ | (0.03 | )
EPS – Diluted (b/f) – continuing operations |  | $ | (0.06 | ) |  | $ | (0.06 | )
EPS – Diluted (d/f) – discontinued operations |  | $ | 0.01 |  |  | $ | (0.03 | )

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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=28368275&loc=SL6953423-111524 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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