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Note 2 - Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2019
Note 2 - Summary of Significant Accounting Policies (Tables) [Line Items] |
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] | An analysis of the allowance for doubtful accounts is as follows:
Balance at January 1, 2019 |  | $ | 224,795 |
Reversal – recoveries by cash |  |  | (169,432 | )
Balance at March 31, 2019 |  | $ | 55,363 |
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] | A reconciliation of the January 1, 2019 through March 31, 2019, the amount of unrecognized tax benefits excluding interest and penalties (“Gross UTB”) is as follows:
|  | Gross UTB 2019 |  |
Balance – January 1, 2019 |  | $ | 722,054 |  |
Decrease in unrecorded tax benefits taken |  |  | (41 | ) |
Balance – March 31, 2019 |  |  | 722,013 |  |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following table presents a reconciliation of basic and diluted (loss) income per share for the three months ended March 31, 2019 and 2018:
|  | Three Months Ended March 31, |
|  | 201 9 |  |  | 201 8 |
Net (Loss) Income |  | $ | (147,531 | ) |  | $ | 1,655,021 |
Weighted average shares outstanding – basic* |  |  | 28,662,557 |  |  |  | 28,253,115 |
Dilutive stock options and unvested restricted stock |  |  | - |  |  |  | 440,364 |
Weighted average shares outstanding – diluted |  |  | 28,662,557 |  |  |  | 28,693,479 |
Net (loss) income per share of common stock |  |  |  |  |  |  |  |
Basic |  | $ | (0.01 | ) |  | $ | 0.06 |
Diluted |  | $ | (0.01 | ) |  | $ | 0.06 |
* Including 889,967 and 821,534 shares that were granted and vested but not yet issued for the three months ended March 31, 2019 and 2018, respectively.
Property Plant and Equipment Estimated Useful Lives [Member] |
Note 2 - Summary of Significant Accounting Policies (Tables) [Line Items] |
Property, Plant and Equipment [Table Text Block] | Depreciation of property and equipment is provided using the straight-line method for substantially all assets with no salvage value and estimated lives as follows:
Computer and office equipment | 5 years
Decoration and renovation | 10 years

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