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Note 12 - Leases (Details Textual) - USD ($)
6 Months Ended
Oct. 31, 2019
May 01, 2019
Apr. 30, 2019
Operating Lease, Right-of-Use Asset $ 9,046,000 $ 9,575,000
Operating Lease, Liability, Total 9,866,000 $ 10,340,000  
Lease Incentive Receivable     $ 765,000
Operating Lease, Expense 750,000    
Operating Lease, Payments $ 694,000