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Stock-Based Compensation; Changes in Equity (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Shares Outstanding at the end of period (in shares) 148,000  
Shares, Exercisable (in shares) 58,400  
Weighted Average Exercise Price, Outstanding at the end of period (in dollars per share) $ 5.22  
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 5.19  
Weighted Average Remaining Contractual Life, Outstanding (in years) 2 years 8 months 12 days  
Weighted Average Remaining Contractual Life, Exercisable (in years) 1 year 8 months 12 days  
Aggregate Intrinsic Value Outstanding (in dollars) $ 181,730  
Aggregate Intrinsic Value, Exercisable (in dollars) $ 73,592  
Employee Stock Option [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Shares Outstanding, beginning of period (in shares) 154,000  
Shares, Granted (in shares) 0  
Shares, Cancelled (in shares) (6,000)  
Shares, Exercised (in shares) 0  
Shares Outstanding at the end of period (in shares) 148,000 154,000
Shares, Exercisable (in shares) 58,400  
Weighted Average Exercise Price, Outstanding, beginning of period (in dollars per share) $ 5.25  
Weighted Average Exercise Price, Granted (in dollars per share)  
Weighted Average Exercise Price, Cancelled/Expired (in dollars per share) $ 5.96  
Weighted Average Exercise Price, Exercised (in dollars per share)  
Weighted Average Exercise Price, Outstanding at the end of period (in dollars per share) $ 5.22 $ 5.25
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 5.19  
Weighted Average Remaining Contractual Life, Outstanding (in years) 2 years 8 months 12 days 2 years 10 months 24 days
Weighted Average Remaining Contractual Life, Exercisable (in years) 1 year 8 months 12 days  
Aggregate Intrinsic Value Outstanding (in dollars) $ 1,450  
Aggregate Intrinsic Value Outstanding (in dollars) 181,730 $ 1,450
Aggregate Intrinsic Value, Exercisable (in dollars) $ 73,592