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Note 12 - Subsequent Events	9 Months Ended
Note 12 - Subsequent Events	Jan. 31, 2019
Notes to Financial Statements
Subsequent Events [Text Block]	12. Subsequent Events: The Company evaluated its January 31, 2019 financial statements for subsequent events through the filing date of this report. In February 2019, the Company purchased an aircraft for $2.9 million. The Company financed the purchase with a four year note for $2.3 million. The interest rate on the note is 6.25%. The Company is not aware of any other subsequent events that would require recognition or disclosure in the financial statements.