Note 13 - Capital Stock and Stock Compensation - Additional Information Regarding Outstanding Stock Options (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Nov. 26, 2016 USD ($) $ / shares shares
Options outstanding, shares (in shares) | shares	66,250
Options exercisable, shares (in shares) | shares	66,250
Options outstanding, aggregate intrinsic value | $	$ 1,257
Options exercisable, aggregate intrinsic value | $	$ 1,257
Range of $3.23 - $6.45 [Member]
Lower range of exercise prices (in dollars per share)	$ 3.23
Upper range of exercise prices (in dollars per share)	$ 6.45
Options outstanding, shares (in shares) | shares	1,000
Options outstanding, weighted average remaining contractual life (Year)	3 years 219 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 4.38
Options exercisable, shares (in shares) | shares	1,000
Options exercisable, weighted average exercise price (in dollars per share)	$ 4.38
Range of $6.45 - $9.67 [Member]
Lower range of exercise prices (in dollars per share)	6.45
Upper range of exercise prices (in dollars per share)	$ 9.67
Options outstanding, shares (in shares) | shares	22,250
Options outstanding, weighted average remaining contractual life (Year)	4 years 219 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 8.02
Options exercisable, shares (in shares) | shares	22,250
Options exercisable, weighted average exercise price (in dollars per share)	$ 8.02
Range of $9.68 - $12.90 [Member]
Lower range of exercise prices (in dollars per share)	9.68
Upper range of exercise prices (in dollars per share)	$ 12.90
Options outstanding, shares (in shares) | shares	28,000
Options outstanding, weighted average remaining contractual life (Year)	328 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 10.60
Options exercisable, shares (in shares) | shares	28,000
Options exercisable, weighted average exercise price (in dollars per share)	$ 10.60
Range of $12.91 - $16.13 [Member]
Lower range of exercise prices (in dollars per share)	12.91
Upper range of exercise prices (in dollars per share)	$ 16.13
Options outstanding, shares (in shares) | shares	15,000
Options outstanding, weighted average remaining contractual life (Year)	146 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 14.73
Options exercisable, shares (in shares) | shares	15,000
Options exercisable, weighted average exercise price (in dollars per share)	$ 14.73