Summary of Significant Accounting Policies (Details Textual) - USD ($)		12 Months Ended
	Feb. 10, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Mar. 04, 2016	Feb. 23, 2016
Summary Of Significant Accounting Policies [Line Items]
Depreciation, Depletion and Amortization, Nonproduction		$ 1,700,000	$ 1,000,000	$ 844,000
Share-based Compensation, Total		$ 673,855	$ 608,645	$ 538,304
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		80,975		152,650
Common Stock, Dividends, Per Share, Declared		$ 0.6	$ 0.6	$ 0.6
Public Utilities, Property, Plant and Equipment, Equipment		$ 3,600,000
Dividends Payable, Date Declared		Feb. 10, 2016
Dividends Payable, Date to be Paid		Mar. 04, 2016
Dividends Payable, Date of Record		Feb. 22, 2016
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant						500,000
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant						850,000
Accounts Receivable [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration Risk, Percentage		10.00%	10.00%	10.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration Risk, Percentage		11.00%	10.00%	10.00%
Subsequent Event [Member]
Summary Of Significant Accounting Policies [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 0.15
Dividends Payable					$ 813,000
Subsequent Event [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant						500,000
Subsequent Event [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant						850,000
Patents [Member]
Summary Of Significant Accounting Policies [Line Items]
Amortization		$ 32,000	$ 26,000	$ 28,000
Legal Cost Capitalized		670,000	656,000	498,000
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months		50,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two		50,000
Finite-Lived Intangible Assets, Amortization Expense, Year Three		50,000
Finite-Lived Intangible Assets, Amortization Expense, Year Four		50,000
Finite-Lived Intangible Assets, Amortization Expense, Year Five		50,000
Software Development [Member]
Summary Of Significant Accounting Policies [Line Items]
Software Development Cost Capitalized		364,000	403,000	715,000
Amortization		$ 429,000	$ 224,000	$ 145,000