Cash and Credit Facilities - Narrative (Details) - Secured Debt - Fifth Third Bank Credit Facility	1 Months Ended		12 Months Ended
	Sep. 30, 2018 USD ($)	Jan. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)
Term loan
Line of Credit Facility [Line Items]
Secured term loan, face amount	$ 25,000,000.0		$ 25,000,000.0
Debt payment term for consecutive monthly installments			59 months
Debt monthly installments amount			$ 312,500
Fixed charge coverage ratio			1.35
Ratio of debt to EBITDA, period one			2.99
Ratio of debt to EBITDA, period two			3.0
Ratio of debt to EBITDA, period three			2.5
Repayments of lines of credit		$ 2,900,000
Voluntary repayment of line of credit	$ 5,600,000
Period covered by voluntary repayment of line of credit	18 months
Term loan | Excess Cash Flows Greater Than or Equal to 2.50
Line of Credit Facility [Line Items]
Percentage of excess cash flow for each year of funded indebtedness to adjusted EBITDA			75.00%
Ratio of funded indebtedness to adjusted EBIDTA			2.50
Term loan | Excess Cash Flows Less Than 2.50 Greater Than 2.00
Line of Credit Facility [Line Items]
Percentage of excess cash flow for each year of funded indebtedness to adjusted EBITDA			50.00%
Term loan | Excess Cash Flows Less Than 2.50 Greater Than 2.00 | Maximum
Line of Credit Facility [Line Items]
Ratio of funded indebtedness to adjusted EBIDTA			2.50
Term loan | Excess Cash Flows Less Than 2.50 Greater Than 2.00 | Minimum
Line of Credit Facility [Line Items]
Ratio of funded indebtedness to adjusted EBIDTA			2.0
Revolving Line of Credit
Line of Credit Facility [Line Items]
Line of credit ceiling	$ 10,000,000		$ 10,000,000
Remaining borrowing availability	8,900,000		8,900,000
Unused borrowing capacity	7,600,000		7,600,000
Stand-by Letters of Credit
Line of Credit Facility [Line Items]
Remaining borrowing availability	$ 1,300,000		$ 1,300,000