Note 3 - Revenue From Contracts With Customers - Contract Liabilities (Details) - USD ($)	9 Months Ended
	Nov. 30, 2020	Nov. 30, 2019
Contract liabilities at the beginning of the year:	$ 1,155,809	$ 1,352,572
Revenue recognized	(174,689)	(270,501)
Contract fees received	161,000	94,583
Amortized gain on the financed sale of equipment	(7,309)	(9,398)
Contract liabilities at the end of the period:	$ 1,134,811	$ 1,167,256