Income taxes (Details)	12 Months Ended
	Feb. 28, 2021 USD ($)
Income taxes (Details) [Line Items]
Income tax expenses unpaid	$ 800
Franchise taxes unpaid	$ 4,000
Allowance deferred tax assets percentage	100.00%
Future taxable income, description	which $164,600,000 may be available to reduce future years’ taxable income through 2037, and $2,600,000 may be available to offset future taxable income indefinitely.
Description of uncertain income tax	An uncertain income tax position will not be recognized if it has less than a 50% likelihood of being sustained. At February 28, 2021 and February 29, 2020, we have no unrecognized tax benefits.
Federal [Member]
Income taxes (Details) [Line Items]
Operating loss carry-forwards	$ 167,200,000
Operating loss carry-forwards, expiration date	2037
State [Member]
Income taxes (Details) [Line Items]
Operating loss carry-forwards	$ 42,800,000
Operating loss carry-forwards, expiration date	2039