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Stockholders' Equity (Details Textual)
 1 Months Ended 6 Months Ended 12 Months Ended
Feb. 03, 2016
USD ($)
$ / shares
shares
Sep. 30, 1995
$ / shares
Dec. 21, 2017
USD ($)
$ / shares
shares
Jul. 27, 2017
USD ($)
Investors
$ / shares
shares
Jun. 30, 2017
shares
Oct. 21, 2016
USD ($)
$ / shares
shares
Oct. 28, 2015
USD ($)
Jun. 30, 2010
shares
Jun. 30, 2000
shares
Jun. 30, 2015
Dec. 31, 2017
USD ($)
Employee
$ / shares
shares
Dec. 31, 2016
USD ($)
Employee
Director
$ / shares
shares
Jun. 15, 2016
shares
Dec. 31, 2015
$ / shares
Aug. 05, 2011
Jun. 06, 2008
Jun. 30, 2001
shares
Stockholders' Equity (Textual)                                  
Potential issuance or sale of equity | $             $ 10,000,000                    
Gross proceeds | $ $ 5,900,000   $ 3,050,000                            
Net proceeds | $ $ 5,313,000   $ 2,734,000                            
Common stock shares sold 1,123,810   417,807                            
Sale of stock, per share | $ / shares $ 5.25   $ 7.30                            
Common stock, shares authorized                     8,000,000 8,000,000          
Stock option and incentive plan, description                     We currently match 100% of the first 3% of each employee's salary that is contributed to the Plan and 50% of the next 2% of each employee's salary that is contributed to the Plan.            
Proceeds from exercise of stock options | $                     $ 49,560 $ 31,975          
Stock option granted during the period                     141,000            
Weighted-average grant date fair values of options granted | $ / shares                     $ 3.51            
Exercise prices of options outstanding | $ / shares                     $ 4.58 $ 3.89   $ 3.57      
Employee stock, plan description                     On June 15, 2017, our Board of Directors voted to authorize an amendment to the Rights Agreement to extend the Final Expiration Date by an additional five years to September 19, 2022.            
Private Placement [Member]                                  
Stockholders' Equity (Textual)                                  
Gross proceeds | $           $ 3,464,000                      
Net proceeds | $           $ 3,161,000                      
Common stock shares sold           659,880                      
Closing share price | $ / shares           $ 5.25                      
Minimum [Member]                                  
Stockholders' Equity (Textual)                                  
Common stock, shares authorized                         8,000,000        
Maximum [Member]                                  
Stockholders' Equity (Textual)                                  
Common stock, shares authorized                         10,000,000        
Investor [Member]                                  
Stockholders' Equity (Textual)                                  
Gross proceeds | $       $ 1,050,000                          
Net proceeds | $       $ 1,034,000                          
Number of related investors | Investors       2                          
Common stock shares issued       200,000                          
Closing share price | $ / shares       $ 5.25                          
Stock Option [Member]                                  
Stockholders' Equity (Textual)                                  
Number of employee exercised stock options | Employee                     6            
Aggregate intrinsic value of options exercised | $                     $ 43,470 $ 31,850          
Weighted-average grant date fair values of options granted | $ / shares                     $ 3.51 $ 4.16          
Weighted average remaining life of options exercisable                     2 years 4 months            
Total unrecognized stock-based compensation related to non-vested stock options | $                     $ 448,187            
Number of director exercised stock options | Director                       1          
Share-based payment, description                     Exercised stock options covering 11,000 shares for cash, resulting in total proceeds of $49,560. The aggregate of 16,000 shares, of which 6,000 were exercised for cash, resulting in total proceeds of $31,900, and 10,000 of these options were exercised by the surrender of 7,334 shares of common stock with a fair market value of $57,425 at the time of exercise and $75 in cash.          
Stock Option [Member] | 46,000 stock options granted [Member]                                  
Stockholders' Equity (Textual)                                  
Stock option granted during the period                       46,000          
Stock Option [Member] | Minimum [Member]                                  
Stockholders' Equity (Textual)                                  
Sale of stock, per share | $ / shares                     $ 5.33            
Exercise prices of options outstanding | $ / shares                     1.70            
Stock Option [Member] | Minimum [Member] | 46,000 stock options granted [Member]                                  
Stockholders' Equity (Textual)                                  
Exercise prices of options outstanding | $ / shares                       $ 6.27          
Stock Option [Member] | Maximum [Member]                                  
Stockholders' Equity (Textual)                                  
Sale of stock, per share | $ / shares                     8.90            
Exercise prices of options outstanding | $ / shares                     $ 8.90            
Stock Option [Member] | Maximum [Member] | 46,000 stock options granted [Member]                                  
Stockholders' Equity (Textual)                                  
Exercise prices of options outstanding | $ / shares                       $ 8.21          
Stock Option [Member] | Employee [Member]                                  
Stockholders' Equity (Textual)                                  
Number of stock options exercised                       16,000          
Proceeds from exercise of stock options | $                       $ 31,900          
Number of employee exercised stock options | Employee                       1          
Number of director exercised stock options | Employee                       1          
2000 Plan [Member] | Stock Option [Member]                                  
Stockholders' Equity (Textual)                                  
Common stock reserved for issuance under the plan                                
Number of stock options exercised                     4,000          
Stock option granted during the period                              
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   5 years 6 months            
Weighted average remaining life of options exercisable                     1 year 6 months            
2010 Plan [Member] | Stock Option [Member]                                  
Stockholders' Equity (Textual)                                  
Common stock reserved for issuance under the plan                     30,500            
Number of stock options exercised                     7,000 16,000          
Stock option granted during the period                     141,000 46,000          
2010 Plan [Member] | Stock Option [Member] | Employee [Member]                                  
Stockholders' Equity (Textual)                                  
Common stock reserved for issuance under the plan               300,000                  
Stock option expiration period               10 years                  
Share-based payment, description               The 2010 Plan expires in June 2020, after which date no further options could be granted under the 2010 Plan.                  
Common Stock Rights Plan [Member]                                  
Stockholders' Equity (Textual)                                  
Share-based payment, description   At any time after a person or group becomes an Acquiring Person and prior to the acquisition by such person or group of 50% or more of the outstanding common stock, the Board of Directors of the Company may exchange the Rights (other than Rights owned by such person or group which have become void), in whole or in part, at an exchange ratio of one share of common stock per Right (subject to adjustment).                              
Common stock purchase price | $ / shares   $ 70.00                              
Employee stock, plan description   The Rights (as amended) become exercisable and transferable apart from the common stock upon the earlier of i) 10 days following a public announcement that a person or group (Acquiring Person) has, without the prior consent of the Continuing Directors (as such term is defined in the Rights Agreement), acquired beneficial ownership of 20% or more of the outstanding common stock or ii) 10 days following commencement of a tender offer or exchange offer the consummation of which would result in ownership by a person or group of 20% or more of the outstanding common stock (the earlier of such dates being called the Distribution Date).               During the second quarter of 2015, we amended our Common Stock Rights Plan by removing a provision that prevented a new group of directors elected following the emergence of an Acquiring Person (an owner of more than 20% of our stock) from controlling the Rights Plan by maintaining exclusive authority over the Rights Plan with pre-existing directors.              
Sale of common stock, description   The Company should consolidate or merge with any other entity and the Company were not the surviving company, or, if the Company were the surviving company, all or part of the Company's common stock were changed or exchanged into the securities of any other entity, or if more than 50% of the Company's assets or earning power were sold.                              
Outstanding rights price per share | $ / shares   $ 0.005                              
Common Stock Rights Plan [Member] | Minimum [Member]                                  
Stockholders' Equity (Textual)                                  
Ownership percentage                             18.00% 15.00%  
Common Stock Rights Plan [Member] | Maximum [Member]                                  
Stockholders' Equity (Textual)                                  
Ownership percentage                             20.00% 18.00%  
2017 Plan [Member] | Stock Option [Member]                                  
Stockholders' Equity (Textual)                                  
Common stock reserved for issuance under the plan                     300,000            
Number of stock options exercised                              
Stock option granted during the period                              
2017 Plan [Member] | Stock Option [Member] | Employee [Member]                                  
Stockholders' Equity (Textual)                                  
Common stock reserved for issuance under the plan         300,000                        
Stock option expiration period         10 years