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Consolidated Condensed Statements of Cash Flows (unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Cash flows from operating activities:    
Net income $ 4,018 $ 3,061
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 1,239 985
Non-voting revenues interest in EAM Trust (3,636) (3,261)
Non-voting profits interest in EAM Trust (335) (362)
Unrealized gains on securities (30)  
Deferred rent (100) 422
Deferred income taxes 64 621
Changes in operating assets and liabilities:    
Unearned revenue (1,025) (1,844)
Reserve for settlement (54) (129)
Operating lease exit obligation   (36)
Accounts payable & accrued expenses (245) (611)
Accrued salaries (266) (180)
Accrued taxes on income 100 730
Prepaid and refundable income taxes 15  
Prepaid expenses and other current assets 36 409
Accounts receivable (42) (209)
Total adjustments (4,279) (3,465)
Net cash used in operating activities (261) (404)
Cash flows from investing activities:    
Purchases of securities classified as available-for-sale   (1,223)
Distributions received from EAM Trust 3,889 3,373
Acquisition of property and equipment (99) (153)
Expenditures for capitalized software (1,148) (1,230)
Net cash provided by investing activities 2,642 767
Cash flows from financing activities:    
Purchase of treasury stock at cost (71) (349)
Dividends paid (2,944) (2,959)
Net cash used in financing activities (3,015) (3,308)
Net change in cash and cash equivalents (634) (2,945)
Cash and cash equivalents at beginning of year 5,788 6,840
Cash and cash equivalents at end of period $ 5,154 $ 3,895