Debt (Details Textual) - USD ($)		1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 15, 2016	Apr. 30, 2017	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Mar. 01, 2017
Short-term Debt [Line Items]
Outstanding borrowings			$ 37,696,000	$ 37,696,000	$ 17,694,000
Long-term debt			28,000,000	28,000,000
Derivative, notional amount		$ 20,000,000					$ 37,000,000
Derivative, fixed interest rate							1.59%
Derivative assets (liabilities), at fair value, net			100,000	100,000
Payments for hedge		$ 500,000		474,000	$ 0	$ 0
Interest Rate Cap [Member]
Short-term Debt [Line Items]
Derivative assets (liabilities), at fair value, net			300,000	300,000
London Interbank Offered Rate (LIBOR) [Member]
Short-term Debt [Line Items]
Derivative, cap interest rate		2.00%
Term Loan [Member]
Short-term Debt [Line Items]
Long-term debt principal	$ 11,100,000
Revolving Credit Facility [Member]
Short-term Debt [Line Items]
Outstanding borrowings	$ 28,900,000		37,700,000	37,700,000
Available borrowing capacity			57,000,000	$ 57,000,000
Interest rate during period (percent)				2.80%	2.20%
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Short-term Debt [Line Items]
Spread on variable rate (percent)	2.50%
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Short-term Debt [Line Items]
Spread on variable rate (percent)	1.25%
Credit Agreement [Member] | Term Loan [Member]
Short-term Debt [Line Items]
Long-term debt principal	$ 40,000,000
Periodic principal payments			1,000,000
Long-term debt			$ 28,000,000	$ 28,000,000
Credit Agreement [Member] | Revolving Credit Facility [Member]
Short-term Debt [Line Items]
Maximum borrowing capacity	$ 100,000,000