Equity Investment Equity Investment (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Feb. 28, 2017	Feb. 28, 2019	Feb. 28, 2018
Schedule of Equity Method Investments [Line Items]
Income (Loss) from Equity Method Investments	$ 6,797	$ 6,618	$ 7,178
Related Party Transaction, Other Revenues from Transactions with Related Party	611	390	315
Due from Affiliate, Current		71	65
Proceeds from Equity Method Investment, Distribution	$ 6,820	6,594	7,247
Retained Earnings, Undistributed Earnings from Equity Method Investees		$ 16,559	$ 16,531
ASA Electronics, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		50.00%

Amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership, due within 1 year (or 1 business cycle).

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Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of consolidated retained earnings that represent undistributed (not yet received) earnings from 50% or less owned persons accounted for by the equity method (equity method investees).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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