ACCOUNTS PAYABLE AND ACCRUED EXPENSES: (Details) - USD ($) $ in Thousands	Apr. 30, 2020	Apr. 30, 2019
ACCOUNTS PAYABLE AND ACCRUED EXPENSES
Total	$ 3,125	$ 2,964
Real estate operations
ACCOUNTS PAYABLE AND ACCRUED EXPENSES
Accrued expenses	518	491
Trade payables	1,146	652
Real Estate customer deposits	1,117	1,198
Other		18
Total	2,781	2,359
Corporate operations
ACCOUNTS PAYABLE AND ACCRUED EXPENSES
Total	$ 344	$ 605