Accounts Receivable and Concentration of Credit Risk (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2020 USD ($) customer	Mar. 31, 2019 customer	Mar. 31, 2020 USD ($) customer	Mar. 31, 2019 customer	Sep. 30, 2019 USD ($) customer
Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit terms			30 days
Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit terms			120 days
Assets, Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Customers					0
Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage			81.00%		66.00%
Number of Customers			3		2
Total Revenue [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	80.00%	82.00%	71.00%	66.00%
Number of Customers	3	4	2	3
Brazil [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit terms			180 days
Long term trade receivable | $	$ 1,100		$ 1,100		$ 300