Equity Investment - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
Feb. 29, 2020	Feb. 28, 2019	Feb. 28, 2018
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments	$ 5,174	$ 6,618	$ 7,178
Proceeds from equity method investment, distribution	5,136	6,594	7,247
Retained earnings, undistributed earnings from equity method investees	16,598	16,559
Related party transaction, other revenues from transactions with related party	501	390	$ 315
Due from affiliate, current	$ 96	$ 71
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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