Note 4 - Calculation of EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 25, 2017	Mar. 26, 2016	Mar. 25, 2017	Mar. 26, 2016
Net Earnings available to common stockholders	$ 15,987	$ 15,588	$ 29,527	$ 28,566
Weighted average number of basic shares (in shares)	18,711	18,637	18,698	18,662
Earnings per basic share (in dollars per share)	$ 0.85	$ 0.84	$ 1.58	$ 1.53
Options
Options (in shares)	110	115	106	134
Options (in dollars per share)		$ (0.01)	$ (0.01)	$ (0.01)
Net Earnings available to common stockholders plus assumed conversions	$ 15,987	$ 15,588	$ 29,527	$ 28,566
Weighted average number of diluted shares (in shares)	18,821	18,752	18,804	18,796
Earnings per diluted share (in dollars per share)	$ 0.85	$ 0.83	$ 1.57	$ 1.52