Note 14 - Capital Stock and Stock Compensation (Details) - Additional Information Regarding Outstanding Stock Options (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Nov. 30, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares, Options outstanding (in Shares)	735,100
Shares, Options exercisable (in Shares)	648,600
Aggregate intrinsic value (in Dollars)	$ 2,053
Aggregate intrinsic value (in Dollars)	$ 1,235
Range of $3.23 - $6.45 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 3.23
Exercise price range, upper range limit	$ 6.45
Shares, Options outstanding (in Shares)	76,350
Weighted average remaining contractual life , Options outstanding	6 years 219 days
Weighted average exercise price, Options outstanding	$ 4.38
Shares, Options exercisable (in Shares)	35,350
Weighted average exercise price, Options exercisable	$ 4.38
Range of $6.45 - $9.67 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 6.45
Exercise price range, upper range limit	$ 9.67
Shares, Options outstanding (in Shares)	62,750
Weighted average remaining contractual life , Options outstanding	7 years 219 days
Weighted average exercise price, Options outstanding	$ 8.04
Shares, Options exercisable (in Shares)	17,250
Weighted average exercise price, Options exercisable	$ 8.02
Range of $9.68 - $12.90 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 9.68
Exercise price range, upper range limit	$ 12.90
Shares, Options outstanding (in Shares)	123,500
Weighted average remaining contractual life , Options outstanding	3 years 328 days
Weighted average exercise price, Options outstanding	$ 10.60
Shares, Options exercisable (in Shares)	123,500
Weighted average exercise price, Options exercisable	$ 10.60
Range of $12.91 - $16.13 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 12.91
Exercise price range, upper range limit	$ 16.13
Shares, Options outstanding (in Shares)	67,500
Weighted average remaining contractual life , Options outstanding	2 years 328 days
Weighted average exercise price, Options outstanding	$ 14.89
Shares, Options exercisable (in Shares)	67,500
Weighted average exercise price, Options exercisable	$ 14.89
Range of $16.14 - $19.35 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 16.14
Exercise price range, upper range limit	$ 19.35
Shares, Options outstanding (in Shares)	150,000
Weighted average remaining contractual life , Options outstanding	2 years 219 days
Weighted average exercise price, Options outstanding	$ 16.96
Shares, Options exercisable (in Shares)	150,000
Weighted average exercise price, Options exercisable	$ 16.96
Range of $19.36 - $22.58 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 19.36
Exercise price range, upper range limit	$ 22.58
Shares, Options outstanding (in Shares)	255,000
Weighted average remaining contractual life , Options outstanding	73 days
Weighted average exercise price, Options outstanding	$ 21.12
Shares, Options exercisable (in Shares)	255,000
Weighted average exercise price, Options exercisable	$ 21.12