Segment Information and Major Customers Net Property, Equipment and Improvements by Geographic Area (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Net property, equipment and improvements	$ 12,132	$ 11,507
North America, primarily United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net property, equipment and improvements	11,941	11,297
International, primarily Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net property, equipment and improvements	$ 191	$ 210