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 ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2016 USD ($) segment		Sep. 30, 2015 USD ($)		Sep. 30, 2014 USD ($)
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.