Accounting Policies and Basis of Presentation - Debt (Details)	Mar. 21, 2016 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Line of Credit Facility [Line Items]
Unamortized loan fees		$ 621,000	$ 636,000
Outstanding borrowings under credit facility		43,675,000
Credit facility, remaining borrowing capacity		$ 43,395,000
Average interest rate (as a percent)		2.54%
Revolver borrowings [Member]
Line of Credit Facility [Line Items]
Outstanding borrowings under credit facility		$ 24,422,000
Fixed asset sub-line term loan [Member]
Line of Credit Facility [Line Items]
Outstanding borrowings under credit facility		5,503,000
Second Amended and Restated Credit Agreement [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 80,000,000
Covenant compliance, maximum individual acquisition allowable (less than)	1,000,000
Covenant compliance, maximum aggregate acquisitions allowable	7,500,000
Loan fees incurred during period		0
Unamortized loan fees		621,000
Third Amended and Restated Agreement [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	95,000,000
Periodic payment, principal	250,000
Covenant compliance, maximum aggregate acquisitions allowable	$ 35,000,000
Covenant compliance, fixed charge coverage ratio excess availability (as a percent) (less than)	17.50%
Minimum [Member] | Second Amended and Restated Credit Agreement [Member]
Line of Credit Facility [Line Items]
Covenant compliance, fixed charge coverage ratio	1.10
Minimum [Member] | Third Amended and Restated Agreement [Member]
Line of Credit Facility [Line Items]
Covenant compliance, fixed charge coverage ratio	1.25
Term Loan [Member] | Third Amended and Restated Agreement [Member]
Line of Credit Facility [Line Items]
Long-term debt	$ 15,000,000	$ 13,750,000