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Note 3 - Earnings Per Share - Distributed and Undistributed Earnings (Details) - $ / shares
3 Months Ended 6 Months Ended
Jul. 02, 2017
Jul. 03, 2016
Jul. 02, 2017
Jul. 03, 2016
Basic Earnings Per Share:        
Distributed Earnings (in dollars per share) $ 0.06 $ 0.05 $ 0.12 $ 0.10
Undistributed Earnings (in dollars per share) 0.27 0.27 0.34 0.41
Total (in dollars per share) 0.33 0.32 0.46 0.51
Diluted Earnings Per Share:        
Distributed Earnings (in dollars per share) 0.06 0.05 0.12 0.10
Undistributed Earnings (in dollars per share) 0.27 0.27 0.34 0.41
Total (in dollars per share) 0.33 0.32 0.46 0.51
Basic earnings per share (in dollars per share) 0.33 0.32 0.46 0.51
Diluted earnings per share (in dollars per share) $ 0.33 $ 0.32 $ 0.46 $ 0.51