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Stockholders' Equity - Stock Options (Details Textual) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 22, 2011 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock option plan expense |  | $ 59,051 |  | $ 90,000 |
Common stock, par value (per share) |  | $ 0.0001 |  | $ 0.0001 |
Percentage of individual ownership of common stock (percentage) | 10.00% |  |  |  |
Share-based compensation arrangement by share-based payment award, options, outstanding, intrinsic value |  | $ 0 |  |  |
Equity Incentive 2011 Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock, par value (per share) |  | $ 0.20 |  |  |
Common shares outstanding |  | 1,346,355 |  | 1,357,837 | 1,040,477
Weighted average remaining life (years), outstanding |  | 7 years 4 days |  | 7 years 2 months 23 days | 6 years 6 months
Common shares expected to vest |  | 795,928 |  |  |
Common shares expected to vest weighted average |  | $ 4.64 |  |  |
Common shares, exercised |  | 0 | 0 |  |
Share-based compensation arrangement by share-based payment award, options, exercisable, intrinsic value |  | $ 0 |  |  |
Weighted average remaining years to vest (in years) |  | 2 years 9 months 15 days |  | 2 years 11 months 27 days | 2 years 5 months
May 2011 and August 2011 Equity Incentive Plans [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Fair Market Value of Incentive Stock Options | 100.00% |  |  |  |
Share-based Payment Arrangement, Option [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized |  | $ 285,236 |  |  |
Individual Stock Ownership in Excess of 10 Percent [Member] | May 2011 and August 2011 Equity Incentive Plans [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Fair Market Value of Incentive Stock Options | 110.00% |  |  |  |
Total vesting period [Member] | Share-based Payment Arrangement, Option [Member] | May 2011 and August 2011 Equity Incentive Plans [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period (in years) | 10 years |  |  |  |
Twelve Months After Grant Date [Member] | May 2011 and August 2011 Equity Incentive Plans [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentage of individual ownership of common stock (percentage) | 25.00% |  |  |  |
Stock option vesting period from grant date (in years) | 1 year |  |  |  |
Monthly in equal installments [Member] | Share-based Payment Arrangement, Option [Member] | May 2011 and August 2011 Equity Incentive Plans [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period (in years) | 3 years |  |  |  |

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