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Consolidated Condensed Balance Sheets (Parentheticals) (USD $)
In Thousands, except Share data, unless otherwise specified
Jan. 31, 2015
Apr. 30, 2014
Statement Of Financial Position [Abstract]    
Short term investments (in dollars) $ 5,005us-gaap_ShortTermInvestments $ 5,482us-gaap_ShortTermInvestments
Allowance for doubtful accounts (in dollars) $ 39us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 39us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Common stock, par value (in dollars per share) $ 0.10us-gaap_CommonStockParOrStatedValuePerShare $ 0.10us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 30,000,000us-gaap_CommonStockSharesAuthorized 30,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 10,000,000us-gaap_CommonStockSharesIssued 10,000,000us-gaap_CommonStockSharesIssued
Treasury stock, shares 187,132us-gaap_TreasuryStockShares 182,071us-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.