Derivative (Narratives) (Details) - USD ($)		3 Months Ended
	Jan. 31, 2018	Mar. 31, 2019	Dec. 31, 2018
Derivative Instruments And Hedging Activities Disclosure [Line Items]
Deferred losses on derivative instruments accumulated in AOCI expected to be reclassified to earnings		$ 93,000
Derivative Interest Rate Swap Effective Percentage		100.00%
Secured Debt		$ 56,342,000	$ 60,795,000
Line of Credit Facility, Maximum Borrowing Capacity	$ 25,000,000
Proceeds from interest rate swaps unwinding		100,000
Other liabilities-non current [Member] | Derivatives qualifying as hedges [Member]
Derivative Instruments And Hedging Activities Disclosure [Line Items]
Notional Amount of Interest Rate Derivatives		$ 32,976,000	$ 34,090,000
Term Loan [Member]
Derivative Instruments And Hedging Activities Disclosure [Line Items]
Notional Amount of Interest Rate Swaps	$ 36,000,000
LIBOR Fixed Rate	2.72%
Secured Debt	$ 64,000,000