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Treasury Stock and Repurchase Program - Components of treasury stock, at cost (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Oct. 31, 2014
Jul. 31, 2014
Jan. 31, 2015
Jan. 31, 2014
Shares        
Balance as of April 30, 2014   182,071us-gaap_TreasuryStockShares [1],[2],[3] 182,071us-gaap_TreasuryStockShares [1],[2],[3]  
Purchases effected in open market 2,008us-gaap_TreasuryStockSharesAcquired 3,053us-gaap_TreasuryStockSharesAcquired    
Balance as of January 31, 2015     187,132us-gaap_TreasuryStockShares  
Total Average Cost Assigned        
Balance as of April 30, 2014   $ 2,122us-gaap_TreasuryStockValue [1],[2],[3] $ 2,122us-gaap_TreasuryStockValue [1],[2],[3]  
Purchases effected in open market 29us-gaap_TreasuryStockValueAcquiredCostMethod 42us-gaap_TreasuryStockValueAcquiredCostMethod 71us-gaap_TreasuryStockValueAcquiredCostMethod 509us-gaap_TreasuryStockValueAcquiredCostMethod
Balance as of January 31, 2015     2,193us-gaap_TreasuryStockValue  
Average Cost per Share        
Balance as of April 30, 2014   $ 11.65valu_TreasuryStockAverageCostPerShare [1],[2],[3] $ 11.65valu_TreasuryStockAverageCostPerShare [1],[2],[3]  
Purchases effected in open market $ 14.44us-gaap_TreasuryStockAcquiredAverageCostPerShare $ 13.76us-gaap_TreasuryStockAcquiredAverageCostPerShare    
Balance as of January 31, 2015     $ 11.72valu_TreasuryStockAverageCostPerShare  
Aggregate Purchase Price Remaining Under the Program        
Balance as of April 30, 2014   2,268valu_StockRepurchaseProgramRemainingAuthorizedAmount [1],[2],[3] 2,268valu_StockRepurchaseProgramRemainingAuthorizedAmount [1],[2],[3]  
Purchases effected in open market $ 2,197us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 $ 2,226us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 $ 2,197us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1  
[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.