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Note 4 - Investments (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Available-for-sale Equity Securities, Amortized Cost Basis, Total |  | $ 12,877,000 | $ 8,541,000 |
Available-for-sale Securities, Equity Securities |  | 14,125,000 | 10,622,000 |
Proceeds from Sale of Available-for-sale Securities, Equity |  | 4,387,000 |  | $ 152,000
Net Income (Loss) Attributable to Parent, Total |  | 15,663,000 | 11,150,000 | 14,738,000
Capital Gain Distribution from Available for Sale Securities | [1] |  |  | 152,000
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent, Total |  | (699,000) | 1,133,000 | 285,000
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax |  | (227,000) | 238,000 | (8,000)
AOCI, Debt Securities, Available-for-sale, Adjustment, after Tax, Total |  | 699,000 | 1,133,000 |
AOCI Tax, Attributable to Parent |  | (76,000) | 238,000 |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent, Total |  | $ (623,000) | $ 895,000 | 325,000
Available-for-sale Securities, Debt Securities, Average Yield |  | 2.27% | 2.09% |
Equity Method Investments |  | $ 59,165,000 | $ 58,625,000 |
EAM Trust [Member] |  |  |  |
Net Income (Loss) Attributable to Parent, Total | [2] | 2,332,000 | 2,098,000 | 1,492,000
Fair Value of Contributed Capital at Inception |  | 55,805,000 | 55,805,000 |
Cash and Liquid Securities in Excess of Working Capital Requirements Contributed to Capital Account |  | 5,820,000 | 5,820,000 |
Equity Method Investment, Other than Temporary Impairment |  | $ 0 | 0 |
Percentage of Non Voting Profit Interest |  | 50.00% |  |
Accrued Non Voting Revenues and Non Voting Profits Interests Payable |  | $ 2,949,000 | 2,420,000 |
Equity Securities [Member] |  |  |  |
Available-for-sale Securities, Gross Realized Gain (Loss), Total |  |  | 0 | 0
Capital Gain Distribution from Available for Sale Securities |  | 0 | 0 |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent, Total |  | 833,000 | 1,087,000 |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax |  | 112,000 | 228,000 |
AOCI, Debt Securities, Available-for-sale, Adjustment, after Tax, Total |  | 1,248,000 | 2,081,000 |
AOCI Tax, Attributable to Parent |  | 325,000 | 437,000 |
Debt Securities [Member] |  |  |  |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax |  | 37,000 | 10,000 |
AOCI, Debt Securities, Available-for-sale, Adjustment, after Tax, Total |  | 177,000 | 43,000 |
AOCI Tax, Attributable to Parent |  | 46,000 | 9,000 |
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale, Total |  | 8,663,000 | 8,346,000 |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent, Total |  | 134,000 | $ 46,000 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Equity Securities [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] |  |  |  |
Net Income (Loss) Attributable to Parent, Total |  | $ (581,000) |  | $ 152,000
[1] | Capital gain distributions of $152,000 were reclassified from Accumulated Other Comprehensive Income in the Consolidated Balance Sheets to the Consolidated Statements of Income in fiscal 2018.
[2] | Represents EAM's net income, after giving effect to Value Line's non-voting revenues interest, but before distributions to voting profits interest holders and to the Company in respect of its 50% non-voting profits interest.

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