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Note 2 - Investments - Assets and Liabilities (Details) - EAM Trust [Member] - USD ($) $ in Thousands | Jan. 31, 2018 | Apr. 30, 2017
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EAM's total assets |  | $ 60,666 | $ 60,432
EAM's total liabilities (1) | [1] | (3,655) | (2,931)
EAM's total equity |  | $ 57,011 | $ 57,501
[1] | At October 31, 2017 and April 30, 2017, EAM's total liabilities included a payable to VLI for its accrued non-voting revenues interest and the 90% distributable share of its non-voting profits interest of $2,218,000 and $1,919,000, respectively.

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