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Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Cash flows from operating activities:    
Net income $ 3,690 $ 3,104
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 71 108
Non-voting revenues interest in EAM Trust (2,588) (1,968)
Non-voting profits interest in EAM Trust (283) (303)
Distributions received from EAM Trust 2,525 2,188
Deferred income taxes 61 (271)
Deferred rent 28 (23)
Other, net (15)
Changes in operating assets and liabilities:    
Unearned revenue (1,989) (1,396)
Accounts payable & accrued expenses (602) (706)
Accrued salaries (75) (94)
Accrued taxes on income 975 344
Prepaid and refundable income taxes 254 437
Prepaid expenses and other current assets 77 50
Accounts receivable (2,246) (26)
Total adjustments (3,792) (1,675)
Net cash (used in)/provided by operating activities (102) 1,429
Cash flows from investing activities:    
Purchase of equity securities (399)
Purchases of fixed income securities classified as available-for-sale (3,222) (2,123)
Proceeds from sales of fixed income securities classified as available-for-sale 2,973 1,637
Acquisition of property and equipment (5)
Net cash used in investing activities (648) (491)
Cash flows from financing activities:    
Purchase of treasury stock at cost (92) (46)
Dividends paid (1,933) (1,841)
Net cash used in financing activities (2,025) (1,887)
Net change in cash and cash equivalents (2,775) (949)
Cash, cash equivalents and restricted cash at beginning of period 6,962 6,410
Cash, cash equivalents and restricted cash at end of period $ 4,187 $ 5,461