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Note 1 - Summary of Operations and Significant Accounting Policies (Detail) - Computation of basic and diluted earnings per share (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Net Income (Loss) from continuing operations attributable to Ultralife (in Dollars) $ (1,097) $ 1,607
Net Income (Loss) from continuing operations attributable to Ultralife common shareholders (a) (in Dollars) (1,097) 1,607
Net Income (Loss) from discontinued operations attributable to Ultralife common shareholders (c) (in Dollars) $ (501) $ (3,687)
Average Common Shares Outstanding – Basic (e) (in Shares) 17,403,000 17,304,000
Effect of Dilutive Securities:    
Stock Options / Warrants (in Shares)   252,218
Average Common Shares Outstanding – Diluted (f) (in Shares) 17,403,000 17,336,000
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)
Stock Options / Warrants [Member]
    
Effect of Dilutive Securities:    
Stock Options / Warrants (in Shares)   32,000