Consolidated Balance Sheets (Parentheticals) - USD ($) shares in Thousands	Sep. 26, 2021	Sep. 27, 2020
Accounts receivable, allowance for doubtful accounts	$ 6,574,000	$ 13,431,000
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authoritzed (in shares)	500	500
Preferred stock, shares issued (in shares)	0	0
Common Class A [Member]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	12,000	12,000
Common stock, shares issued (in shares)	5,889	5,835
Common stock, shares outstanding (in shares)	5,889	5,835
Common Class B [Member]
Common stock, par value (in dollars per share)	$ 2	$ 2
Common stock, shares authorized (in shares)	3,000	3,000
Common stock, shares issued (in shares)	0	0