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Consolidated Condensed Balance Sheets (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified | Jan. 31, 2015 | Apr. 30, 2014
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Statement Of Financial Position [Abstract] |  |  |
Short term investments (in dollars) | $ 5,005 us-gaap_ShortTermInvestments | $ 5,482 us-gaap_ShortTermInvestments |
Allowance for doubtful accounts (in dollars) | $ 39 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | $ 39 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent |
Common stock, par value (in dollars per share) | $ 0.10 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.10 us-gaap_CommonStockParOrStatedValuePerShare |
Common stock, shares authorized | 30,000,000 us-gaap_CommonStockSharesAuthorized | 30,000,000 us-gaap_CommonStockSharesAuthorized |
Common stock, shares issued | 10,000,000 us-gaap_CommonStockSharesIssued | 10,000,000 us-gaap_CommonStockSharesIssued |
Treasury stock, shares | 187,132 us-gaap_TreasuryStockShares | 182,071 us-gaap_TreasuryStockShares | [1],[2],[3]
[1] | Includes 18,400 shares with a total average cost of $354,000 that were acquired prior to the repurchase program authorized in January 2011.
[2] | Includes 85,219 shares with a total average cost of $1,036,000 that were acquired during the former repurchase program, which was authorized in January 2011 and expired in January 2012.
[3] | Includes 78,452 shares with a total average cost of $732,000 that were acquired during the current repurchase program authorized in September 2012.

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