Note 8 - Retirement Plan (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Defined Contribution Plan, Cost Recognized	$ 0.3	$ 0.2	$ 0.2
Number of Years of Employee Service Required to Be Eligible for 401k Plan	1 year