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Financial Instruments and Risk Management – Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2017
Risks Inherent in Cash and Cash Equivalents
Cash, interest and non-interest-bearing accounts - unrestricted	$ 10,956	$ 19,631
Money market funds	915	1,107
Cash and cash equivalents of continuing operations, ending balance	$ 11,871	$ 20,738
Minimum \| Cash
Risks Inherent in Cash and Cash Equivalents
Interest rate (as a percent)	0.00%	0.00%
Minimum \| Money market accounts
Risks Inherent in Cash and Cash Equivalents
Interest rate (as a percent)	0.00%	0.00%
Maximum \| Cash
Risks Inherent in Cash and Cash Equivalents
Interest rate (as a percent)	0.30%	0.35%
Maximum \| Money market accounts
Risks Inherent in Cash and Cash Equivalents
Interest rate (as a percent)	1.25%	0.03%
International operations - transactions denominated in foreign currencies \| Geographic concentration \| Net sales revenue
Risks Inherent in Cash and Cash Equivalents
Concentration risk percentage	13.00%	13.00%	13.00%