Compensation Plans - 401k, Profit Sharing and Deferred Compensation Plans (Details)		12 Months Ended
	May 17, 2006 item	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Deferred compensation plan
Employer-matching contribution		$ 0.60
Defined Contribution Plan, Cost Recognized		$ 50,000	$ 48,000
Deferred Compensation Plan
Deferred compensation plan
Requisite deferral as a percentage of annual profit sharing award		50.00%
Profit sharing pool reserved		$ 1,126,000	850,000
Deferred Compensation Plan | Minimum
Deferred compensation plan
Distribution period from the year of the first deferral	3 years
Number of installments for payment under the deferred compensation plan | item	2
Deferred Compensation Plan | Maximum
Deferred compensation plan
Number of installments for payment under the deferred compensation plan | item	5
2016 Profit Sharing Plan
Deferred compensation plan
Percentage of annual pretax income contributed into the pool		12.50%
Requisite deferral as a percentage of annual profit sharing award		50.00%
Profit Sharing Plan awards deferred into the Deferred Plan to be paid out as stock		$ 563,000	$ 425,000