Note 4 - Earnings Per Share - Distributed and Undistributed Earnings (Details) - $ / shares	3 Months Ended
	Apr. 01, 2018	Apr. 02, 2017
Basic Earnings Per Share:
Distributed Earnings (in dollars per share)	$ 0.06	$ 0.06
Undistributed Earnings (in dollars per share)	0.19	0.07
Total (in dollars per share)	0.25	0.13
Diluted Earnings Per Share:
Distributed Earnings (in dollars per share)	0.06	0.06
Undistributed Earnings (in dollars per share)	0.19	0.07
Total (in dollars per share)	0.25	0.13
Basic earnings per share (in dollars per share)	0.25	0.13
Diluted earnings per share (in dollars per share)	$ 0.25	$ 0.13