Note 12 - Capital Stock and Stock Compensation - Changes in Non-vested Options (Details) - Restricted Stock [Member]	12 Months Ended
	Nov. 28, 2020 $ / shares shares
Non-vested restricted shares outstanding at November 30, 2019 (in shares) | shares	90,153
Non-vested restricted shares outstanding at November 30, 2019 (in dollars per share) | $ / shares	$ 29.06
Granted (in shares) | shares	0
Granted (in dollars per share) | $ / shares	$ 0
Vested (in shares) | shares	(48,653)
Vested (in dollars per share) | $ / shares	$ 27.30
Forfeited (in shares) | shares	(7,000)
Forfeited (in dollars per share) | $ / shares	$ 19.03
Non-vested restricted shares outstanding at November 28, 2020 (in shares) | shares	34,500
Non-vested restricted shares outstanding at November 28, 2020 (in dollars per share) | $ / shares	$ 33.58