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Long-term debt (Details) - USD ($)
Feb. 28, 2019
Feb. 28, 2018
Long-term debt $ 870,531 $ 1,026,651
Due within one year 162,816 156,119
Due after one year 707,715 870,532
Note payable, bank, collateralized by land and buildings, payable in monthly installments of principal and interest of $16,358 through January 2024. Interest rate 4.15%. 10 year term.    
Long-term debt $ 870,531 $ 1,026,651