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Earnings (Loss) Per Share (Details)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2015
Apr. 30, 2014
Basic and Diluted weighted-average number of shares [Abstract]        
Basic weighted-average number of shares 11,449us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 11,339us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 11,426us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 10,878us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities:        
Shares underlying stock options 5us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants 7us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants 6us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants   
Non-vested restricted Class B common stock 425us-gaap_IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends 303us-gaap_IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends 405us-gaap_IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends   
Diluted weighted-average number of shares 11,879us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 11,649us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 11,837us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 10,878us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding