Note 8 - Employee Benefit Plans - Net Periodic Pension Costs and Related Components (Details) (USD $)	3 Months Ended		6 Months Ended
	Mar. 28, 2015	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014
Pension Plan [Member]
Interest cost	$ 33,000	$ 34,000	$ 66,000	$ 68,000
Expected return on plan assets	(45,000)	(41,000)	(90,000)	(82,000)
Recognized net actuarial loss	13,000	11,000	26,000	22,000
Net periodic pension cost	1,000	4,000	2,000	8,000
Supplemental Employee Retirement Plan [Member]
Interest cost	81,000	79,000	162,000	158,000
Recognized net actuarial loss	29,000	13,000	58,000	26,000
Net periodic pension cost	182,000	147,000	364,000	294,000
Service cost	$ 72	$ 55	$ 144	$ 110