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Stockholders' Equity (Details Textual) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
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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 |  |  |  |  |

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- Definition General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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