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Stockholders' Equity (Details Textual)
1 Months Ended 6 Months Ended 12 Months Ended
Feb. 03, 2016
USD ($)
$ / shares
shares
Jan. 06, 2016
USD ($)
$ / shares
Oct. 28, 2015
USD ($)
Jun. 30, 2010
shares
Jun. 30, 2000
shares
Jun. 30, 2016
USD ($)
Employee
$ / shares
shares
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Employee
$ / shares
shares
Dec. 31, 2014
USD ($)
Employee
$ / shares
shares
Dec. 31, 2013
$ / shares
Jun. 30, 2001
shares
Stockholders' Equity (Textual)                      
Potential issuance or sale of equity | $     $ 10,000,000                
Gross proceeds | $ $ 5,900,000 $ 5,958,000                  
Net proceeds | $ $ 5,313,000                    
Common stock shares sold 1,123,810                    
Sale of stock, per share | $ / shares $ 5.25                    
Closing share price | $ / shares   $ 8.08                  
Common stock, shares authorized           10,000,000   8,000,000      
Proceeds from exercise of stock options | $           $ 3,150 $ 45,140        
Employee [Member]                      
Stockholders' Equity (Textual)                      
Common stock reserved for issuance under the plan           270,000          
Stock Option [Member]                      
Stockholders' Equity (Textual)                      
Exercise prices of options outstanding | $ / shares           $ 3.96   $ 3.57 $ 3.42 $ 3.30  
Aggregate intrinsic value of options exercised | $           $ 4,000   $ 110,000 $ 1,000    
Weighted-average grant date fair values of options granted | $ / shares           $ 3.57   $ 3.46 $ 2.26    
Total unrecognized stock-based compensation related to non-vested stock options | $           $ 211,178          
Outstanding non-vested stock options cost expected to be recognized | $           $ 41,476          
Stock Option [Member] | 37,000 stock options granted [Member]                      
Stockholders' Equity (Textual)                      
Stock option granted during the period           37,000          
Stock Option [Member] | 16,000 stock options granted [Member]                      
Stockholders' Equity (Textual)                      
Stock option granted during the period               16,000      
Stock Option [Member] | 25,000 stock options granted [Member]                      
Stockholders' Equity (Textual)                      
Stock option granted during the period                 25,000    
Stock Option [Member] | Minimum [Member]                      
Stockholders' Equity (Textual)                      
Exercise prices of options outstanding | $ / shares           $ 1.70          
Stock Option [Member] | Minimum [Member] | 37,000 stock options granted [Member]                      
Stockholders' Equity (Textual)                      
Exercise prices of options outstanding | $ / shares           6.70          
Stock Option [Member] | Minimum [Member] | 16,000 stock options granted [Member]                      
Stockholders' Equity (Textual)                      
Exercise prices of options outstanding | $ / shares               $ 6.05      
Stock Option [Member] | Minimum [Member] | 25,000 stock options granted [Member]                      
Stockholders' Equity (Textual)                      
Exercise prices of options outstanding | $ / shares                 $ 4.25    
Stock Option [Member] | Maximum [Member]                      
Stockholders' Equity (Textual)                      
Exercise prices of options outstanding | $ / shares           7.54          
Stock Option [Member] | Maximum [Member] | 37,000 stock options granted [Member]                      
Stockholders' Equity (Textual)                      
Exercise prices of options outstanding | $ / shares           $ 6.93          
Stock Option [Member] | Maximum [Member] | 16,000 stock options granted [Member]                      
Stockholders' Equity (Textual)                      
Exercise prices of options outstanding | $ / shares               $ 7.54      
Stock Option [Member] | Maximum [Member] | 25,000 stock options granted [Member]                      
Stockholders' Equity (Textual)                      
Exercise prices of options outstanding | $ / shares                 $ 4.80    
Stock Option [Member] | Employee [Member]                      
Stockholders' Equity (Textual)                      
Number of stock options exercised           1,000   28,000 1,000    
Proceeds from exercise of stock options | $           $ 3,150   $ 120,210 $ 3,149    
Number of employee exercised stock options | Employee           1   11 1    
2000 Plan [Member] | Stock Option [Member]                      
Stockholders' Equity (Textual)                      
Common stock reserved for issuance under the plan           0          
Number of stock options exercised           0   (26,000) 0    
Stock option granted during the period           0   0 0    
2000 Plan [Member] | Stock Option [Member] | Employee [Member]                      
Stockholders' Equity (Textual)                      
Stock option and incentive plan description        
No less than 85% of fair market value on the date of grant in the case of non-qualified stock options.
           
Common stock reserved for issuance under the plan         250,000           500,000
Stock option expiration period         10 years 4 years 6 months          
Weighted average remaining life of options exercisable           2 years 6 months          
2010 Plan [Member] | Stock Option [Member]                      
Stockholders' Equity (Textual)                      
Common stock reserved for issuance under the plan           156,500          
Number of stock options exercised           (1,000)   (2,000) (1,000)    
Stock option granted during the period           37,000   16,000 25,000    
2010 Plan [Member] | Stock Option [Member] | Employee [Member]                      
Stockholders' Equity (Textual)                      
Stock option and incentive plan description      
No less than 85% of fair market value on the date of grant in the case of non-qualified stock options.
             
Common stock reserved for issuance under the plan       300,000              
Stock option expiration period       10 years   4 years 6 months          
Weighted average remaining life of options exercisable           2 years 6 months