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CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 27, 2016
Mar. 29, 2015
Income Statement [Abstract]    
Revenues $ 20,833 $ 19,177
Cost of products sold 14,428 13,170
Gross profit 6,405 6,007
Operating expenses:    
Research and development 1,656 1,359
Selling, general and administrative 4,267 3,826
Total operating expenses 5,923 5,185
Operating income 482 822
Other (expense) income:    
Interest income   1
Interest and financing expense (102) (67)
Miscellaneous (11) (122)
Other Operating Income (Expense), Net, Total (113) (188)
Income before income taxes 369 634
Income tax provision (88) (111)
Net income 281 523
Net loss attributable to non-controlling interest 18 10
Net income attributable to Ultralife Corporation 299 533
Other comprehensive (loss) income Foreign currency translation adjustments (279) 22
Comprehensive income attributable to Ultralife Corporation $ 20 $ 555
Net income per share attributable to Ultralife common shareholders - basic:    
Total $ 0.02 $ 0.03
Net income per share attributable to Ultralife common shareholders - diluted:    
Total $ 0.02 $ 0.03
Weighted average shares outstanding - basic 15,323 17,346
Potential common shares 343 8
Weighted average shares outstanding - diluted 15,666 17,354