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Note 2 - Summary of Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 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  

Provision for the period

    10,185  

Reversal – recoveries by cash

    (224,795

)

Balance at September 30, 2019

  $ 10,185  
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]
A reconciliation of the January 1, 2019 through September 30, 2019 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

    (612,746 )
         

Balance – September 30, 2019

  $ 109,308  
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 nine and three months ended September 30, 2019 and 2018:

   

Nine Months Ended September 30,

   

Three Months Ended September 30,

 
   

2019

   

2018

   

2019

   

2018

 
                                 

Net (Loss) Income

  $ (581,864

)

  $ 2,526,293     $ (396,148

)

  $ (492,033

)

                                 

Weighted average shares outstanding – basic*

    28,583,907       28,349,945       28,386,099       28,439,977  

Dilutive stock options and unvested restricted stock

    -       309,710       -       -  

Weighted average shares outstanding – diluted

    28,583,907       28,659,655       28,386,099       28,439,977  
                                 

Net (loss) income per share of common stock

                               

Basic

  $ (0.02

)

  $ 0.09       (0.01

)

  $ (0.02

)

Diluted

  $ (0.02

)

  $ 0.09       (0.01

)

  $ (0.02

)

*

Including 1,021,524 and 836,534 shares that were granted and vested but not yet issued for the nine months ended September 30, 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 – 10 years

Decoration and renovation

5 – 10 years