Note 10 - Earnings Per Share - Basic and Diluted Earnings Per Share Attributable to Common Shareholders (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Mar. 30, 2019	Dec. 29, 2018	Mar. 31, 2018	Dec. 30, 2017	Mar. 30, 2019	Mar. 31, 2018
Net earnings	$ 1,049	$ 4,126	$ 5,879	$ 8,111	$ 5,175	$ 13,990
Basic weighted average shares outstanding (in shares)	19,242		19,052		19,233	19,047
Dilutive effect of stock-based compensation (in shares)	98		206		105	194
Diluted weighted average shares outstanding (in shares)	19,340		19,258		19,338	19,241
Net earnings per share:
Basic (in dollars per share)	$ 0.05		$ 0.31		$ 0.27	$ 0.73
Diluted (in dollars per share)	$ 0.05		$ 0.31		$ 0.27	$ 0.73