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Note 11 - Components of comprehensive income that are included in Consolidated Statement of Changes in Shareholders' Equity (Details) - USD ($)
 12 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Apr. 30, 2014
Change in unrealized gains on securities $ (300,000) $ (274,000) $ (44,000)
Change in unrealized gains on securities 106,000 96,000 15,000
Change in unrealized gains on securities (194,000) (178,000) (29,000)
Less: Gains realized in net income 329,000 57,000 36,000
Less: Gains realized in net income (115,000) (20,000) (13,000)
Less: Gains realized in net income 214,000 37,000 23,000
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent 29,000 (217,000) (8,000)
Other comprehensive income (loss), available-for-sale securities, tax (expense)/(benefit) (9,000) 76,000 3,000
Other comprehensive income (loss), available-for-sale securities adjustment, net of tax $ 20,000 $ (141,000) $ (5,000)