Note 3 - Revenue From Contracts With Customers - Contract Liabilities (Details) - USD ($)	6 Months Ended
	Aug. 31, 2020	Aug. 31, 2019
Contract liabilities at the beginning of the year:	$ 1,155,809	$ 1,352,572
Revenue recognized	(128,636)	(188,209)
Contract fees received	53,500	57,833
Amortized gain on the financed sale of equipment	(4,176)	(6,267)
Contract liabilities at the end of the period:	$ 1,076,497	$ 1,215,929