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Stockholders' Equity (Details Textual)
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 03, 2016
USD ($)
$ / shares
shares
Sep. 30, 1995
$ / shares
Nov. 20, 2018
USD ($)
Dec. 21, 2017
USD ($)
$ / shares
shares
Jul. 27, 2017
USD ($)
Investors
$ / shares
shares
Oct. 21, 2016
USD ($)
$ / shares
shares
Oct. 28, 2015
USD ($)
Jun. 30, 2010
shares
Jun. 30, 2000
shares
Mar. 31, 2019
USD ($)
Director
$ / shares
shares
Mar. 31, 2018
USD ($)
$ / shares
Dec. 31, 2018
$ / shares
shares
Jun. 14, 2018
shares
Jun. 30, 2017
shares
Jun. 15, 2016
shares
Jun. 30, 2001
shares
Stockholders' Equity (Textual)                                
Potential issuance or sale of equity | $             $ 10,000,000                  
Gross proceeds | $ $ 5,900,000     $ 3,050,000           $ 9,000,000            
Net proceeds | $ $ 5,313,000     $ 2,734,000           $ 8,303,000            
Common stock shares sold 1,123,810     417,807           1,636,364            
Sale of stock, per share | $ / shares $ 5.25     $ 7.30           $ 5.50            
Common stock, shares authorized                   11,000,000   11,000,000        
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 | $                   $ 2 $ 4,156          
Potential issuance cost in equity securities | $     $ 20,000,000                          
Registration statement, description                   Having raised $10,000,000 in gross proceeds under the February 2016, July 2017 and December 2017 equity transactions.            
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                    
Stock Options Granted [Member]                                
Stockholders' Equity (Textual)                                
Weighted average remaining life of options exercisable                   3 years 1 month            
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                      
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).               Our Board of Directors also has voted to authorize amendments to increase the ownership threshold for determining "Acquiring Person" status to 20%. During the second quarter of 2015, our Board of Directors also voted to authorize an amendment to remove 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                            
Option expiry date                   Sep. 19, 2022            
Employee Stock Option [Member]                                
Stockholders' Equity (Textual)                                
Number of directors exercised stock options | Director                   1            
Aggregate intrinsic value of options exercised | $                   $ 28,641 $ 24,800          
Weighted-average grant date fair values of options granted | $ / shares                   $ 3.16 $ 4.22          
Total unrecognized stock-based compensation related to non-vested stock options | $                   $ 562,225            
Exercise prices of options outstanding | $ / shares                   $ 6.51   $ 6.37        
Weighted average remaining life of unrecognized stock-based compensation related to non-vested                   1 year 7 months            
Employee Stock Option [Member] | Two Thousand Ten Plan [Member]                                
Stockholders' Equity (Textual)                                
Common stock reserved for issuance under the plan                   13,000            
Weighted average remaining life of options outstanding                   6 years 6 months            
Number of stock options exercised                              
Stock option granted during the period                     48,500        
Employee Stock Option [Member] | Two Thousand Ten Plan [Member] | Employee [Member]                                
Stockholders' Equity (Textual)                                
Common stock reserved for issuance under the plan               300,000                
Stock option expiration period               10 years                
Weighted average remaining life of options exercisable                   3 years 1 month            
Share-based payment, description               The 2010 Plan expires in June 2020, after which date no further options could be granted under the 2010 Plan.                
Option expiry date               Jun. 30, 2020                
Employee Stock Option [Member] | Two Thousand Plan [Member]                                
Stockholders' Equity (Textual)                                
Common stock reserved for issuance under the plan                              
Weighted average remaining life of options outstanding                   6 years 6 months            
Number of stock options exercised                              
Stock option granted during the period                            
Employee Stock Option [Member] | Two Thousand Plan [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              
Weighted average remaining life of options exercisable                   3 years 1 month            
Option expiry date                 Feb. 28, 2010              
Employee Stock Option [Member] | Two Thousand Seventeen Plan [Member]                                
Stockholders' Equity (Textual)                                
Common stock reserved for issuance under the plan                   178,500            
Weighted average remaining life of options outstanding                   6 years 6 months            
Number of stock options exercised                              
Stock option granted during the period                   10,000   122,500        
Weighted-average grant date fair values of options granted | $ / shares                   $ 7.50            
Employee Stock Option [Member] | Two Thousand Seventeen Plan [Member] | Employee [Member]                                
Stockholders' Equity (Textual)                                
Common stock reserved for issuance under the plan                           300,000    
Weighted average remaining life of options exercisable                   3 years 1 month            
Equity Option [Member]                                
Stockholders' Equity (Textual)                                
Stock option granted during the period                   10,000            
Weighted-average grant date fair values of options granted | $ / shares                   $ 3.16            
Share-based payment, description                   Stock options covering 15,000 shares by the surrender of 10,731 shares of common stock with a fair market value of $71,998 at the time of exercise and $2 in cash. Two employees exercised stock options covering 6,000 shares. One thousand of these options were exercised for cash, resulting in total proceeds of $4,150 and 5,000 of these options were exercised by the surrender of 2,040 shares of common stock with a fair market value of $14,994 at the time of exercise and $6 in cash.          
Maximum [Member]                                
Stockholders' Equity (Textual)                                
Common stock, shares authorized                         11,000,000   10,000,000  
Maximum [Member] | Stock Options Granted [Member]                                
Stockholders' Equity (Textual)                                
Weighted-average grant date fair values of options granted | $ / shares                     $ 7.80          
Minimum [Member]                                
Stockholders' Equity (Textual)                                
Common stock, shares authorized                         8,000,000   8,000,000  
Minimum [Member] | Stock Options Granted [Member]                                
Stockholders' Equity (Textual)                                
Weighted-average grant date fair values of options granted | $ / shares                     $ 7.08