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STOCKHOLDERS' DEFICIT (Narrative) (Details) - USD ($) |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 03, 2020 | Feb. 12, 2020 | Aug. 15, 2019 | Nov. 24, 2017 | Feb. 20, 2020 | Feb. 18, 2020 | Aug. 28, 2019 | Mar. 31, 2019 | Jan. 31, 2018 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2020 | Jun. 30, 2019 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Apr. 23, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock authorized |  |  |  |  |  |  |  |  |  | 10,000,000 |  | 10,000,000 |  | 10,000,000 |  |  | 10,000,000 | 10,000,000 |  |  |  | 10,000,000
Issuance of common stock |  |  |  |  |  |  |  |  |  |  | $ 9,253,128 |  |  | $ 9,250,000 |  |  |  |  |  |  |  |
Issuance of common stock, shares |  |  |  |  |  | 1,350,000 |  |  |  |  | 1,542,188 |  |  | 1,542,188 |  |  |  |  |  |  |  |
Shares available for grant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 321,429 |  |  |  |  |
Common stock issued for services |  |  |  |  |  |  |  |  |  | $ 7,500 | $ 7,500 |  |  |  |  |  | $ 32,917 | $ 73,708 |  |  |  |
Treasury stock |  |  |  |  |  |  |  |  |  | $ 157,452 |  | $ 149,459 |  | $ 157,452 |  |  | $ 157,452 | $ 149,459 |  |  | $ 148,000 |
Treasury stock shares |  |  |  |  |  |  |  |  |  | 1,324 |  | 457 |  | 1,324 |  |  | 1,324 | 457 |  |  | 235 |
Repurchase of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,151 |  | $ 7,993 | $ 1,459 |  |  |  |
Options granted |  |  |  |  |  |  |  |  |  |  |  |  |  | 310,290 |  |  | 8,572 |  |  |  |  |
Number of forfeited options |  |  |  |  |  |  |  |  |  |  |  |  |  | 161,402 |  |  | 14,286 |  |  |  |  |
Warrants to purchase shares of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,464,000 |
Proceeds from warrants exercise |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,164,019 |  | $ 2,318,020 | 195,000 |  |  |  |
Total compensation cost for stock options not yet recognized |  |  |  |  |  |  |  |  |  | $ 282,142 |  | $ 22,200 |  | $ 282,142 |  |  | $ 29,298 | $ 22,200 |  |  |  |
Common stock par value |  |  |  |  |  |  |  |  |  | $ 0.001 |  | $ 0.001 |  | $ 0.001 |  |  | $ 0.001 | $ 0.001 |  |  |  |
Total compensation cost for stock options not yet recognized, period |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |
Exercise price of stock option |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.39 |  |  | $ 14.00 |  |  |  |  |
Warrants expired, forfeited, cancelled or exercised |  |  |  |  |  |  |  |  |  |  |  |  |  | 102,800 |  |  |  |  |  |  |  |
Strike price of the cancelled options |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14.00 |  |  |  |  |  |  |  |
ThinkEquity [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, shares |  | 1,350,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock par value |  | $ 0.001 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public offering price |  | $ 6.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  |  |  | $ 1,542 |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, shares |  |  |  |  |  |  |  |  |  |  | 1,542,188 |  |  |  |  |  |  |  |  |  |  |
Conversion of preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 750,000 | $ 375,000 |  |  |  |  |
Common stock issued for services |  |  |  |  |  |  |  |  |  | $ 2 | $ 2 |  |  |  |  |  | $ 4 | $ 4 |  |  |  |
Common stock issued for services, shares |  |  |  |  |  |  |  |  |  | 1,632 | 1,611 |  |  |  |  |  | 4,523 | 3,729 |  |  |  |
Conversion of stock shares converted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 107,142 | 53,571 |  |  |  |  |
Conversion of stock converted value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 750,000 | $ 375,000 |  |  |  |  |
Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price |  |  |  |  |  |  |  |  |  | $ 9.00 |  |  |  | 9.00 |  |  |  |  |  |  |  |
Public offering price |  |  |  |  |  |  |  |  |  | $ 6.00 |  |  |  | $ 6.00 |  |  |  |  |  |  |  |
Warrants expired, forfeited, cancelled or exercised |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 338,575 | 21,429 |  |  |  |
Percentage of strike price |  |  |  |  |  |  |  |  |  | 150.00% |  |  |  | 150.00% |  |  |  |  |  |  |  |
Over-Allotment Option [Member] | ThinkEquity [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, shares |  | 202,500 |  |  | 192,188 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock par value |  |  |  |  | $ 6.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Closing date of public offering |  | Feb. 18, 2020 |  |  | Feb. 21, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee stock options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price |  |  |  |  |  |  |  |  |  | $ 4.74 |  |  |  | $ 4.74 |  |  |  |  |  |  |  |
Expected term |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years 6 months |  |  |  |  |  |  |  |
Expected volatility |  |  |  |  |  |  |  |  |  |  |  |  |  | 81.00% |  |  |  |  |  |  |  |
Dividend yield |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk free interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.255% |  |  |  |  |  |  |  |
Day of issuance |  |  |  |  |  |  |  |  |  | $ 4.70 |  |  |  | $ 4.70 |  |  |  |  |  |  |  |
Shareholder [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  |  |  |  |  | $ 21,429 |  |  |  |  |  |  |  |  |
Issuance of common stock, shares |  |  |  |  |  |  |  |  |  |  |  |  | 195,000 |  |  |  |  |  |  |  |  |
Exercise price |  |  |  |  |  |  |  | $ 9.10 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase shares of common stock |  |  |  |  |  |  |  | 214,286 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from warrants exercise |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,650,000 |  |  |  |  |
Reduced exercise price |  |  |  |  |  |  |  | $ 7.70 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholder [Member] | Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  |  |  |  |  | $ 21,429 |  |  |  |  |  |  |  |  |
Issuance of common stock, shares |  |  |  |  |  |  |  |  |  |  |  |  | 195,000 |  |  |  |  |  |  |  |  |
Exercise price |  |  |  |  |  |  |  |  |  |  |  |  | $ 9.10 |  |  |  |  |  |  |  |  |
Shareholder [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Market value of stock repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10.08 | $ 7.00 |  |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 115 | $ 84 |  |  |  |
Shareholder [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Market value of stock repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9.09 | $ 6.30 |  |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 753 | $ 140 |  |  |  |
Series B Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |
Preferred stock, shares issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,000 |  |  |  |  |
Conversion price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7.00 |  |  |  |  |
Conversion of preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |
Conversion of stock converted value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |
Series B Convertible Preferred Stock [Member] | SPA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued |  |  |  | 2,830 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of preferred stock |  |  |  | $ 2,830,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of stock converted value |  |  |  | $ 2,830,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series B Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock authorized |  |  |  |  |  |  |  |  |  | 15,000 |  | 15,000 |  | 15,000 |  |  | 15,000 | 15,000 |  |  |  |
Preferred stock, shares issued |  |  |  | 1,705 |  |  |  |  |  | 1,705 |  | 2,830 |  | 1,705 |  |  | 1,705 | 2,830 |  |  |  |
Preferred stock, shares outstanding |  |  |  | 1,705 |  |  |  |  |  | 1,705 |  | 2,830 |  | 1,705 |  |  | 1,705 | 2,830 |  |  |  |
Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,878 |  |  |  |  |  |  |
Warrants to purchase shares of common stock |  |  |  |  |  |  |  | 214,286 |  |  |  |  |  |  | 66,756 | 19,643 | 357 |  |  |  |  |
Proceeds from warrants exercise |  |  |  |  |  |  |  | $ 1,650,000 |  |  |  |  |  |  | $ 514,020 | $ 151,250 | $ 2,750 |  |  |  |  |
Common stock issued for cashless exercise |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 46,571 |  |  |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of stock shares converted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 750 | 375 |  |  |  |  |
Employee Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock on the date of grant, term of the stock option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | not exceed 10 years |  |  |  |  |
Voting rights |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | more than 10% of the total combined voting power of all classes of capital stock |  |  |  |  |
Aggregate fair market value of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  |  |
Employees and Directors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 199,070 | $ 28,133 |  | $ 44,874 |  |  |  |  |
Two Directors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,144 |  |  |  |  |
Board and Former Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of forfeited options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,286 |  |  |  |  |
Board of Directors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price | $ 4.74 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued for services |  |  |  |  |  |  | $ 19,167 |  | $ 73,708 |  |  |  |  |  |  |  | $ 13,750 |  |  |  |  |
Common stock issued for services, shares |  |  |  |  |  |  | 2,484 |  | 3,729 |  |  |  |  |  |  |  | 2,039 |  |  |  |  |
Options granted | 310,290 |  | 8,572 |  |  |  |  |  |  | 310,290 |  |  |  | 8,572 |  |  |  |  |  |  |  |
Number of forfeited options | 161,402 |  |  |  |  |  |  |  |  | 161,402 |  |  |  |  |  |  |  |  |  |  |  |
Total compensation cost for stock options not yet recognized, period |  |  |  |  |  |  |  |  |  | 1 year 9 months |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of stock option | $ 6.00 |  | $ 14.00 |  |  |  |  |  |  |  |  |  |  | $ 14.00 |  |  |  |  |  |  |  |
Stock option plan expense |  |  |  |  |  |  |  |  |  | $ 88,170 |  |  |  | $ 370,312 |  |  |  |  |  |  |  |
Exercise Amount | $ 149,424 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Board of Directors [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of stock option |  |  |  |  |  |  |  |  |  | $ 4.74 |  |  |  |  |  |  |  |  |  |  |  |
Vesting Period | 9 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Board of Directors [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of stock option |  |  |  |  |  |  |  |  |  | $ 6.00 |  |  |  |  |  |  |  |  |  |  |  |
Vesting Period | 21 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Board of Directors [Member] | Before Reclassification [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted | 160,866 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of forfeited options | 536 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employees [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price |  |  |  |  |  |  |  |  |  |  |  | $ 14.00 |  |  |  |  |  | $ 14.00 |  |  |  |
Common stock issued for services |  |  |  |  |  |  |  |  |  |  |  | $ 72,292 |  |  |  |  |  |  |  |  |  |
Common stock issued for services, shares |  |  |  |  |  |  |  |  |  |  |  | 5,164 |  |  |  |  |  |  |  |  |  |
President and Chief Operating Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of forfeited options |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,286 |  |  |  |  |  |  |
Shareholder [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of shares was increased |  |  |  |  |  |  |  |  |  |  |  |  |  | 321,429 |  |  |  |  |  |  |  |
2016 Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Common stock under Awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,327 |  |  |  |  |
Shares available for grant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 178,572 |  |
2016 Equity Incentive Plan [Member] | Employees and Directors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares available for grant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 163,010 |  | 160,152 |  |  |
2016 Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares available for grant |  |  |  |  |  |  |  |  |  | 178,572 |  |  |  | 178,572 |  |  |  |  |  |  |  |

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