Description of Business and Summary of Significant Accounting Policies Stock-Based Compensation Notes (Details) (USD $)	3 Months Ended			12 Months Ended			3 Months Ended
	Feb. 28, 2015	Nov. 30, 2014	May 31, 2013	Feb. 28, 2015 Rate	Feb. 28, 2014	Feb. 28, 2013 Rate	Nov. 30, 2009	Oct. 16, 2014	Dec. 31, 2012	Feb. 29, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 1,899,000			$ 1,899,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value				26,000	4,671,000	1,845,000
Allocated Share-based Compensation Expense, Net of Tax				102	228	113
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate				0.00%		0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	1,437,000			1,437,000
Allocated Share-based Compensation Expense				521,000	641,000	435,000
Stock Issued During Period, Shares, Restricted Stock Award, Gross	118,058		100,000		84,588
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price								$ 7.76	$ 6.79
Difference Between Option Grant Price and Stock Fair Value								$ 0.25	$ 0.25
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableContractualTerm	2 years 6 months 0 days	3 years 0 months 0 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate				56.00%		51.30%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate				0.80%		0.32%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term				3 years 0 months 0 days		2 years 6 months 0 days
Allocated Share Based Compensation Expense Per Diluted Share				$ 0.00	$ 0.01	$ 0.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options	204,204			204,204
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 7.46			$ 7.46
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term				1 year 10 months 25 days
Employee Stock Option [Member]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	227,000			227,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0	125,000		140,000	0	273,750	256,250
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Market Value	$ 1.99	2.78		$ 2.78		$ 1.99
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period				0	0	26,250
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 7.46			$ 7.46	$ 6.79	$ 6.85				$ 6.72
Warrant [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	17,500	15,000
Restricted Stock [Member]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	1,685,000			1,685,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				118,058	84,588	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Market Value	$ 7.77		7.60		$ 13.62
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period				0	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 10.21			$ 10.21	$ 13.62	$ 7.60				$ 7.60
Maximum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit				$ 7.76
Minimum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit				$ 6.79
Employee Stock Option [Member]
Allocated Share-based Compensation Expense				162,000	363,000	182,000
Restricted Stock [Member]
Allocated Share-based Compensation Expense				359,000	278,000	253,000
Selling and Marketing Expense [Member] | Employee Stock Option [Member]
Allocated Share-based Compensation Expense				39,000	50,000	25,000
General and Administrative Expense [Member] | Employee Stock Option [Member]
Allocated Share-based Compensation Expense				111,000	300,000	149,000
Engineering and Technical Support [Member] | Employee Stock Option [Member]
Allocated Share-based Compensation Expense				3,000	3,000	3,000
Cost of Sales [Member] | Employee Stock Option [Member]
Allocated Share-based Compensation Expense				$ 9,000	$ 10,000	$ 5,000