Equity Investment Equity Investment (Details) - USD ($) $ in Thousands	12 Months Ended
Feb. 28, 2018	Feb. 28, 2017	Feb. 29, 2016
Schedule of Equity Method Investments [Line Items]
Income (Loss) from Equity Method Investments	$ 7,178	$ 6,797	$ 6,538
Related Party Transaction, Other Revenues from Transactions with Related Party	315	611	1,608
Due from Affiliate, Current	65	51
Proceeds from Equity Method Investment, Distribution	7,247	6,820	$ 6,237
Retained Earnings, Undistributed Earnings from Equity Method Investees	$ 16,531	$ 16,600
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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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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Reflects the sum of all other revenue and income realized from sales and other transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period.

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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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