Note 12 - Stockholders' Equity - Stock Options Outstanding (Details) - $ / shares		12 Months Ended
		Dec. 30, 2018		Dec. 31, 2017	Jan. 01, 2017
Outstanding at December 31, 2017 (in shares)		82,500
Outstanding at December 31, 2017 (in dollars per share)		$ 8.53
Granted (in shares)		0		0	0
Granted (in dollars per share)		$ 0
Exercised (in shares)		40,000
Exercised (in dollars per share)		$ 7.43
Forfeited or cancelled (in shares)		0
Forfeited or cancelled (in dollars per share)		$ 0
Outstanding at December 30, 2018 (a) (in shares)		42,500	[1]	82,500
Outstanding at December 30, 2018 (a) (in dollars per share)		$ 9.56	[1]	$ 8.53
Exercisable at December 30, 2018 (b) (in shares)	[2]	42,500
Exercisable at December 30, 2018 (b) (in dollars per share)	[2]	$ 9.56

[1] At December 30, 2018, the weighted-average remaining contractual life of options outstanding was 1.0 years.

[2] At December 30, 2018, the weighted-average remaining contractual life of options exercisable was 1.0 years.