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Provision for (benefit from) Income Taxes (Details)
 9 Months Ended
Apr. 30, 2018
USD ($)
Provision for (benefit from) Income taxes (Textual)  
Reduction of deferred tax assets $ 425,000
Norwegian corporate tax rate [Member]  
Provision for (benefit from) Income taxes (Textual)  
Description of increase decrease corporate income tax rate percentage The decrease in the Norwegian corporate tax rate from 24.0% to 23.0% resulted in an increase in deferred tax expense of approximately $7,000.
U.S. corporate tax rate [Member]  
Provision for (benefit from) Income taxes (Textual)  
Description of increase decrease corporate income tax rate percentage Lowering the U.S. corporate income tax rate from 35.0 % to 21.0% effective January 1, 2018.
U.S. federal corporate tax rate [Member]  
Provision for (benefit from) Income taxes (Textual)  
Description of increase decrease corporate income tax rate percentage The decrease in the U.S. federal corporate tax rate from 35.0% to 21.0% will result in a blended statutory tax rate of 26.4% for the fiscal year ending July 31, 2018.