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Commitments & Contingencies and Tax Matters (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2014
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2019
Apr. 30, 2018
Commitments & Contingencies and Tax Matters (Textual)          
Lawsuit approximate amount $ 1,600,000        
Selling, general and administrative expense   $ 2,289,000 $ 2,195,000 $ 6,761,000 $ 7,753,000
Norway SkatteFUNN [Member]          
Commitments & Contingencies and Tax Matters (Textual)          
Research and development in Norwegian trade and industry   $ 36,000   $ 36,000  
Selling, general and administrative expense     $ 0   $ 39,200