Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Current assets:
Allowance for doubtful accounts	$ 746	$ 1,062
Stockholders’ equity:
Preferred stock, par value (in USD per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Common stock, par value (in USD per share)	$ 0.01	$ 0.01
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	116,338,000	115,333,000
Common stock, shares outstanding	116,338,000	115,333,000