Subsequent Events (Details) - USD ($)	May 10, 2018	Mar. 31, 2018
Line of Credit
Subsequent Event [Line Items]
Line of credit, maximum borrowing capacity		$ 10,000,000
Notes Payable to Banks [Member] | Line of Credit
Subsequent Event [Line Items]
Line of credit, maximum borrowing capacity		10,000,000.0
Notes Payable to Banks [Member] | Letter of Credit
Subsequent Event [Line Items]
Line of credit, maximum borrowing capacity		$ 1,000,000.0
Subsequent Event | Notes Payable to Banks [Member] | Line of Credit | Fifth Third Bank [Member]
Subsequent Event [Line Items]
Line of credit, maturity extension period	3 years
Subsequent Event | Notes Payable to Banks [Member] | Letter of Credit | Fifth Third Bank [Member]
Subsequent Event [Line Items]
Line of credit, maximum borrowing capacity	$ 2,000,000.0