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Note 9 - Related-party Transactions (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Director David Hayden [Member] | Consulting Fees [Member]    
Related Party Transaction, Amounts of Transaction $ 135 $ 135
Chief Executive Officer [Member]    
Accrued Liabilities, Current, Total 748 623
BHCMC, LLC [Member]    
Accounts Receivable, Related Parties, Current 780 780
Wayne Stewart [Member]    
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party 533 370
Craig Stewart [Member]    
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party 743 475
Jeff Shinkle [Member]    
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party $ 282 $ 237