Equity Investments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2018	Aug. 31, 2017	Feb. 28, 2018
Equity in income of equity investees	$ 1,637	$ 1,927	$ 3,451	$ 3,730
Equity Method Investment, Summarized Financial Information, Current Assets	44,901		44,901		$ 42,318
Equity Method Investment, Summarized Financial Information, Noncurrent Assets	6,638		6,638		7,095
Equity Method Investment, Summarized Financial Information, Current Liabilities	7,441		7,441		5,699
Equity Method Investment Summarized Financial Information, Equity	$ 44,098		44,098		$ 43,714
Equity Method Investment, Summarized Financial Information, Revenue			50,560	49,477
Equity Method Investment, Summarized Financial Information, Gross Profit (Loss)			16,509	16,137
Equity Method Investment, Summarized Financial Information, Income (Loss) from Continuing Operations			6,806	7,391
Equity Method Investment, Summarized Financial Information, Net Income (Loss)			$ 6,902	$ 7,460
ASA Electronics, LLC [Member]
Equity Method Investment, Ownership Percentage	50.00%		50.00%		50.00%