Note 4 - Earnings Per Share - Distributed and Undistributed Earnings (Details) - $ / shares	3 Months Ended
	Mar. 31, 2019	Apr. 01, 2018
Basic Earnings Per Share:
Distributed Earnings (in dollars per share)	$ 0.07	$ 0.06
Undistributed Earnings (in dollars per share)	0.05	0.19
Total (in dollars per share)	0.12	0.25
Diluted Earnings Per Share:
Distributed Earnings (in dollars per share)	0.07	0.06
Undistributed Earnings (in dollars per share)	0.05	0.19
Total (in dollars per share)	0.12	0.25
Basic earnings per share (in dollars per share)	$ 0.12	$ 0.25