Annual report pursuant to Section 13 and 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)
 3 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
Jun. 30, 2016
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Mar. 31, 2016
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Dec. 31, 2015
USD ($)
Sep. 30, 2015
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Jun. 30, 2015
USD ($)
Mar. 31, 2015
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Dec. 31, 2014
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Sep. 30, 2016
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segment
Sep. 30, 2015
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Sep. 30, 2014
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Revenues from External Customers and Long-Lived Assets [Line Items]                      
Number of Reportable Segments | segment                 1    
Net revenues to external customers $ 3,563,106 $ 5,560,776 $ 4,772,801 $ 8,230,659 $ 7,154,985 $ 7,813,207 $ 10,977,467 $ 6,659,206 $ 22,127,342 $ 32,604,865 $ 24,490,586
Long-Lived Asset 8,852,000       1,377,000       8,852,000 1,377,000  
Brazil [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net revenues to external customers [1]                 6,008,000 14,841,000 [2]
Zimbabwe [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net revenues to external customers                 3,305,000 [1] 2,696,000 [2] 2,064,000 [2]
U.S. [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net revenues to external customers                 2,464,000 [1] 2,029,000 2,381,000
Long-Lived Asset 7,963,000       123,000       7,963,000 123,000  
South Africa [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net revenues to external customers                 1,117,000 2,331,000 2,928,000 [1],[2]
Angola [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net revenues to external customers [2]                 2,477,000 [1]
DR of Congo [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net revenues to external customers [2]                 2,185,000
Tanzania [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net revenues to external customers [2]                 1,936,000
Malaysia [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net revenues to external customers [2]                
Long-Lived Asset 796,000       1,134,000       796,000 1,134,000  
U.K. [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net revenues to external customers [2]                 [1] [1]
Long-Lived Asset $ 93,000       $ 120,000       93,000 120,000  
Other Countries [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net revenues to external customers [2]                 $ 9,233,000 $ 10,708,000 $ 10,520,000
Net Revenues Less Than Five Percent [Member] | Total Revenue [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Concentration risk, percentage                 5.00%    
Net Revenues Exceeding Ten Percent [Member] | Total Revenue [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Concentration risk, percentage                 10.00%    
[1] Exceeds 10 percent of total net revenues.
[2] Less than 5 percent of total net revenues.