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Note 1 - Nature of Operations (Details Textual) - USD ($)
2 Months Ended 3 Months Ended
Mar. 16, 2021
Jan. 31, 2021
Jul. 31, 2020
Jan. 31, 2020
Cash and Cash Equivalents, at Carrying Value, Ending Balance   $ 8,713,193 $ 5,147,703 $ 10,272,315
Available-for-sale Securities, Current, Total   4,000,000    
Long-Term Debt, Maturity, Year One   18,000,000    
Working Capital (Deficit)   (5,000,000)    
At-the-market Offering [Member]        
Proceeds from Issuance of Common Stock, Net   $ 1,074,337    
Subsequent Event [Member] | At-the-market Offering [Member]        
Proceeds from Issuance of Common Stock, Net $ 28,246,612