Annual report pursuant to Section 13 and 15(d)

Provision for Income Taxes - Additional Information (Details)

v3.21.2
Provision for Income Taxes - Additional Information (Details) - USD ($)
Sep. 30, 2021
Sep. 30, 2020
Income Tax Contingency [Line Items]    
Deferred tax assets, gross $ 4,168,000 $ 3,772,000
Fuel tax credits 300,000 300,000
Goodwill expected to be deductible to tax purposes 68,500,000 22,600,000
Unrecognized tax benefits 0 0
State    
Income Tax Contingency [Line Items]    
Operating loss carryforwards $ 15,200,000 $ 15,300,000