Summary of Significant Accounting Policies (Details)	3 Months Ended	12 Months Ended
	Apr. 02, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Summary of Significant Accounting Policies (Details) [Line Items]
Number of Reportable Segments		1
Inventory, Gross		$ 23,000,000	$ 20,900,000
Inventory Valuation Reserves		1,300,000	1,400,000
Capitalized Computer Software, Net		2,400,000	$ 2,700,000
Life Insurance Policy, Numbers Held			27
Cash Surrender Value of Life Insurance			$ 22,253,000
Proceeds from Life Insurance Policies	$ 28,100,000	28,139,000
Payments for (Proceeds from) Life Insurance Policies		$ (22,400,000)
Reclassification from Accounts Payable to Deferred Revenue			442,000
Borrowings Against Cash Surrender Value [Member]
Summary of Significant Accounting Policies (Details) [Line Items]
Secured Debt			$ 5,500,000