Debt, Subsequent Event (Details) - USD ($) $ in Millions	1 Months Ended
	Nov. 30, 2017	Nov. 17, 2017
BOA Renewal of Line of Credit [Member]
Subsequent Event [Line Items]
Maximum borrowing capacity under renewed facility		$ 30.0
Expiration date of renewed facility		Mar. 31, 2018
Line of Credit Facility, Interest Rate Description		a rate agreed upon between the lender and borrower at the time loan is made
Regions Renewal of Line of Credit [Member]
Subsequent Event [Line Items]
Maximum borrowing capacity under renewed facility	$ 30.0
Description of variable interest rate basis	one month LIBOR
Basis spread on variable interest rate (in hundredths)	2.50%
Expiration date of renewed facility	Apr. 30, 2018
Line of Credit Facility, Interest Rate Description	one month LIBOR plus 2.5%