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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value - Fixed Income Securities [Member] - USD ($)
$ in Thousands
Oct. 31, 2021
Apr. 30, 2021
FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Line Items]    
Fair Value, Less than 12 months $ 1,913 $ 1,793
Unrealized Losses, Less than 12 months (22) (52)
Fair Value, 12 Months or more 1,325 614
Unrealized Losses, 12 Months or more (82) (50)
Fair Value 3,238 2,407
Unrealized Losses $ (104) $ (102)