Note 8 - Employee Benefit Plans - Net Periodic Pension Costs and Related Components (Details) - Supplemental Employee Retirement Plan [Member] - USD ($) $ in Thousands	3 Months Ended
	Dec. 30, 2017	Dec. 31, 2016
Interest cost	$ 86	$ 85
Service cost	77	86
Recognized net actuarial loss	38	43
Net periodic pension cost	$ 201	$ 214