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Note 9 - Margin Loan Payable (Details Textual) - Oct. 28, 2021 - Margin loan facility [member]
$ / shares in Units, $ in Millions
CAD ($)
shares
USD ($)
$ / shares
shares
Statement Line Items [Line Items]    
Borrowings, maximum borrowing limit $ 24.7 $ 20,000,000
Borrowings, maximum unutilized portion   $ 10,000,000
Borrowings, standby fee, percent 3.00% 3.00%
Borrowings, facility fee, percent 1.50% 1.50%
Borrowings, securities pledged as collateral, shares (in shares) | shares 20,000,000 20,000,000
Borrowings, margin call, loan-to-value ratio, percent 27.95% 27.95%
Borrowings, margin call, payment fee, basis   $ 10,000,000
Borrowings, extension option additional fee, percent 1.50% 1.50%
Borrowings, early repayment date trigger, share price (in dollars per share) | $ / shares   $ 2.56
London Inter-Bank Offered Rate (LIBOR) [member]    
Statement Line Items [Line Items]    
Borrowings, adjustment to interest rate basis 5.65% 5.65%