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Note 6 - Supplier Concentrations (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
May 28, 2014
Apr. 30, 2016
Jul. 31, 2016
Apr. 30, 2016
Jul. 31, 2016
Jan. 31, 2016
Supplier Concentration Risk [Member] | Account Receivable from Suppliers [Member]            
Concentration Risk, Percentage         0.00%  
Supplier Concentration Risk [Member]            
Concentration Risk, Percentage         100.00% 100.00%
Pillsbury Winthrop Shaw Pittman L L P [Member]            
Gain (Loss) Related to Litigation Settlement $ 0          
Lump Sum Legal Fee 1,500,000          
Accrued Professional Fees $ 400,000          
Interest Rate for Outstanding Legal Fees Payable Solely with Settlement 20.00%          
Zheng Ge Electrical Company Ltd [Member]            
Accounts Receivable, Write-offs     $ 100,000      
Accounts Payable, Write-offs     600,000      
Pillsbury Winthrop Shaw Pittman L L P [Member] | Litigation Reserve [Member]            
Liabilities, Current   $ 100,000 100,000 $ 100,000 $ 100,000  
Pillsbury Winthrop Shaw Pittman L L P [Member]            
Payments for Legal Settlements   $ 400,000   $ 400,000    
Liabilities, Current     $ 452,000   $ 452,000 $ 1,570,000