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Note 4 - Investments - Income from Securities Transactions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2021
Dec. 31, 2020
Apr. 30, 2020
Dec. 31, 2019
Apr. 30, 2019
Dividend income $ 573   $ 352   $ 257
Interest income 137   279   201
Investment gains/(losses) recognized on sales of equity securities during the period [1],[2] 835   (1,075)  
Unrealized gains/(losses) recognized on equity securities held at the end of the period 3,875   (339)   1,087
Other   (6)   46
Total investment gains/(losses) $ 5,420 $ (789) $ (789) $ 1,591 $ 1,591
[1] Realized gains of $1,481,000 were reclassified from Accumulated Other Comprehensive Income in the Consolidated Balance Sheets to the Consolidated Statements of Income in fiscal 2021.
[2] Realized losses of $581,000 resulting from tax loss harvesting were reclassified from Accumulated Other Comprehensive Income in the Consolidated Balance Sheets to the Consolidated Statements of Income in fiscal 2020.