Note 5 - Intangible Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Amortization of Intangible Assets, Total	$ 71	$ 72	$ 143	$ 143
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	100		100
Finite-Lived Intangible Assets, Amortization Expense, Year Two	$ 20		$ 20