Significant Accounting Policies (Estimated Annual Patent Amortization Expense) (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Total patent amortization expense	$ 338,000	$ 369,000
Patents [Member]
2016	31,000
2017	31,000
2018	31,000
2019	31,000
2020	31,000
Thereafter	183,000
Total patent amortization expense	$ 338,000