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16. INCOME TAXES (Details-Deferred tax assets and liabilities) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets: |  |
Charitable contributions | $ 2,900 | $ 4,128
Reserve for bad debt | 17,948 | 25,548
Stock options | 3,416,792 | 4,776,104
Depreciation | 6,920 | 33,638
Other | 17,674 | 25,159
Net operating loss carryforward | 6,957,507 | 9,167,042
Total gross deferred tax assets | 10,419,741 | 14,031,619
Less: Deferred tax asset valuation allowance | (10,351,807) | (13,934,915)
Total net deferred tax assets | 67,934 | 96,704
Deferred tax liabilities: |  |
Accrued salaries | (67,934) | (96,704)
Total deferred tax liabilities | (67,934) | (96,704)
Total net deferred taxes | $ 0 | $ 0

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