Buildings, equipment, furnishings and leasehold improvements (Details) - USD ($)	Feb. 29, 2024	Feb. 28, 2023
Property, Plant and Equipment [Line Items]
Totals	$ 9,722,595	$ 8,934,703
Less: Accumulated depreciation	(6,890,439)	(6,309,707)
Equipment, furnishings and leasehold improvements, net	2,832,156	2,624,996
Building [Member]
Property, Plant and Equipment [Line Items]
Totals	2,250,000	2,250,000
Laboratory Equipment [Member]
Property, Plant and Equipment [Line Items]
Totals	1,733,911	1,647,951
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Totals	1,891,345	1,807,817
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Totals	924,356	789,044
Tradeshow And Demonstration Equipment [Member]
Property, Plant and Equipment [Line Items]
Totals	1,151,899	1,137,346
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Totals	$ 1,771,084	$ 1,302,545