Note 15 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Finance Lease, Right-of-Use Asset	$ 100
Finance Lease, Right-of-Use Asset, Accumulated Amortization	7
Sublease, Income, Monthly	15
Operating Lease, Expense	1,300	$ 800	$ 700
Other Current Liabilities [Member]
Finance Lease, Liability, Current	100
Other Noncurrent Liabilities [Member]
Finance Lease, Liability, Noncurrent	$ 17