Quarterly report pursuant to Section 13 or 15(d)

Industry Segments and Financial Information About Foreign and Domestic Operations (Schedule Of Operations By Geographic Area) (Details)

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Industry Segments and Financial Information About Foreign and Domestic Operations (Schedule Of Operations By Geographic Area) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]          
Net revenues to external customers $ 4,314,068 $ 5,560,776 $ 9,963,186 $ 18,564,236  
Net Revenues Less Than Five Percent [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Concentration risk, percentage     5.00%    
Net Revenues Exceeding Ten Percent [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Concentration risk, percentage     10.00%    
Mozambique [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Net revenues to external customers     $ 1,430,000 [1] [2]  
Zimbabwe [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Net revenues to external customers [1]     1,271,000 2,478,000  
South Africa [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Net revenues to external customers     955,000 [2]  
Cameroon [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Net revenues to external customers     891,000 [2]  
U.S. [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Net revenues to external customers     790,000 1,847,000  
Long-Lived Asset 35,721,000   35,721,000   $ 7,963,000
Nigeria [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Net revenues to external customers     696,000 [2]  
Brazil [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Net revenues to external customers     [2] 6,008,000 [1]  
Malaysia [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Net revenues to external customers [2]      
Long-Lived Asset 567,000   567,000   796,000
U.K. [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Net revenues to external customers [2]      
Long-Lived Asset $ 77,000   77,000   $ 93,000
Other Countries [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Net revenues to external customers     $ 3,930 $ 8,231  
[1] Countries exceeding 10 percent of total net revenues
[2] * Countries with less than 5 percent of total net revenues