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Commitments & Contingencies and Tax Matters (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2014
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2018
Apr. 30, 2017
Commitments & Contingencies and Tax Matters (Textual)          
Lawsuit approximate amount $ 1,600,000        
Amounts receivable from Norway's SkatteFUNN government   $ 212,000   $ 212,000  
Selling, general and administrative   2,195,000 $ 2,151,000 7,753,000 $ 6,222,000
Related to prior periods value         204,000
Norway SkatteFUNN [Member]          
Commitments & Contingencies and Tax Matters (Textual)          
Selling, general and administrative   $ 0 $ 33,000 $ 39,000 $ 289,000