Note 18 - Major Customers (Details Textual) - Customer Concentration Risk [Member]	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue Benchmark [Member]
Number Of Major Customers	1	3	2	3
Revenue Benchmark [Member] | One Customer [Member]
Concentration Risk, Percentage	30.00%
Revenue Benchmark [Member] | Customer 1 [Member]
Concentration Risk, Percentage		15.00%	43.00%	22.00%
Revenue Benchmark [Member] | Customer 2 [Member]
Concentration Risk, Percentage		11.00%	11.00%	11.00%
Revenue Benchmark [Member] | Customer 3 [Member]
Concentration Risk, Percentage		10.00%		11.00%
Accounts Receivable [Member]
Number Of Major Customers			3	3
Accounts Receivable [Member] | Customer 1 [Member]
Concentration Risk, Percentage			30.00%	15.00%
Accounts Receivable [Member] | Customer 2 [Member]
Concentration Risk, Percentage			14.00%	13.00%
Accounts Receivable [Member] | Customer 3 [Member]
Concentration Risk, Percentage			11.00%	12.00%