Related Party (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Related Party Transactions [Abstract]
Trust expenses subsidized	$ 80,000	$ 71,000	$ 100,000
Long-term receivable due from the National Flex trust	$ 1,000,000