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Note 2 - Supplementary Cash Flows Information - Supplementary Cash Flow Elements (Details) - USD ($)
12 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2019
Cash and cash equivalents $ 19,171,000 $ 4,954,000 $ 6,493,000
Restricted cash 469,000 469,000 469,000
Total cash, cash equivalents, and restricted cash shown in the Consolidated Statement of Cash Flows 19,640,000 5,423,000 6,962,000
State and local income tax payments 1,406,000 1,105,000 387,000
Federal income tax payments to the Parent $ 7,154,000 $ 3,325,000 $ 2,700,000