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Note 12 - Commitments and Contingencies (Tables) | 3 Months Ended
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Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract] |
Lease, Cost [Table Text Block] | The components of lease costs, lease term and discount rate with respect of leases with an initial term of more than 12 months are as follows:
|  | Three Months Ended |
|  | March 31, 2019 |
Operating lease cost |  | $ | 146,069 |
Weighted Average Remaining Lease Term - Operating leases |  | 5.58 years |
Weighted Average Discount Rate - Operating leases |  |  | 5 | %
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] | The following is a schedule, by years, of maturities of lease liabilities as of March 31, 2019:
|  | Operating Leases |
The remainder of 2019 |  | $ | 441,127 |
Fiscal year 2020 |  |  | 604,811 |
Fiscal year 2021 |  |  | 622,956 |
Fiscal year 2022 |  |  | 641,644 |
Fiscal year 2023 |  |  | 660,894 |
Thereafter |  |  | 508,000 |
Total undiscounted cash flows |  |  | 3,479,432 |
Less: imputed interest |  |  | (454,153 | )
Present value of lease liabilities |  | $ | 3,025,279 |

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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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