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Stockholders' Equity (Details - Options by exercise price (Details - Options Outstanding and Exercisable) - Equity Option [Member] - $ / shares | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options Outstanding | 315,000 | 210,000
Options outstanding, exercise price | $ 4.80 | $ 9.61
Options Exercisable | 315,000 |
Range 1 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options Outstanding | 30,000 |
Options outstanding, exercise price | $ 5.70 |
Options Exercisable | 30,000 |
Range 2 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options Outstanding | 30,000 |
Options outstanding, exercise price | $ 5.70 |
Options Exercisable | 30,000 |
Range 3 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options Outstanding | 30,000 |
Options outstanding, exercise price | $ 5.70 |
Options Exercisable | 30,000 |
Range 4 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options Outstanding | 30,000 |
Options outstanding, exercise price | $ 5.70 |
Options Exercisable | 30,000 |
Range 5 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options Outstanding | 30,000 |
Options outstanding, exercise price | $ 5.70 |
Options Exercisable | 30,000 |
Range 6 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options Outstanding | 30,000 |
Options outstanding, exercise price | $ 5.70 |
Options Exercisable | 30,000 |
Range 7 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options Outstanding | 30,000 |
Options outstanding, exercise price | $ 5.70 |
Options Exercisable | 30,000 |
Range 8 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options Outstanding | 15,000 |
Options outstanding, exercise price | $ 3.00 |
Options Exercisable | 15,000 |
Range 9 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options Outstanding | 15,000 |
Options outstanding, exercise price | $ 3.00 |
Options Exercisable | 15,000 |
Range 10 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options Outstanding | 15,000 |
Options outstanding, exercise price | $ 3.00 |
Options Exercisable | 15,000 |
Range 11 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options Outstanding | 15,000 |
Options outstanding, exercise price | $ 3.00 |
Options Exercisable | 15,000 |
Range 12 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options Outstanding | 15,000 |
Options outstanding, exercise price | $ 3.00 |
Options Exercisable | 15,000 |
Range 13 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options Outstanding | 15,000 |
Options outstanding, exercise price | $ 3.00 |
Options Exercisable | 15,000 |
Range 14 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options Outstanding | 15,000 |
Options outstanding, exercise price | $ 3.00 |
Options Exercisable | 15,000 |

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