Equity Investments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2017	Aug. 31, 2016	Feb. 28, 2017
Equity Method Investment, Ownership Percentage	20.00%		20.00%
Equity in income of equity investees	$ 1,927	$ 1,545	$ 3,730	$ 3,353
Equity Method Investment, Summarized Financial Information, Current Assets	43,783		43,783		$ 43,643
Equity Method Investment, Summarized Financial Information, Noncurrent Assets	6,983		6,983		6,207
Equity Method Investment, Summarized Financial Information, Current Liabilities	8,086		8,086		5,998
Equity Method Investment Summarized Financial Information, Equity	$ 42,680		42,680		$ 43,852
Equity Method Investment, Summarized Financial Information, Revenue			49,477	47,864
Equity Method Investment, Summarized Financial Information, Gross Profit (Loss)			16,137	15,093
Equity Method Investment, Summarized Financial Information, Income (Loss) from Continuing Operations			7,391	6,686
Equity Method Investment, Summarized Financial Information, Net Income (Loss)			$ 7,460	$ 6,706
ASA Electronics, LLC [Member]
Equity Method Investment, Ownership Percentage	50.00%		50.00%		50.00%