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Note 12 - Earnings (Loss) Per Share - Common Stock ("EPS") (Tables) | 6 Months Ended
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Jun. 30, 2019
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months ended June 30, |  |  | Six Months ended June 30, |
|  | 201 9 |  |  | 201 8 |  |  | 201 9 |  |  | 201 8 |
Basic Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | $ | (1,425,743 | ) |  | $ | (1,655,465 | ) |  | $ | (3,229,251 | ) |  | $ | (3,847,456 | )
Convertible preferred stock dividends |  |  | - |  |  |  | (41,870 | ) |  |  | - |  |  |  | (198,033 | )
Net loss available to common stockholders |  | $ | (1,425,743 | ) |  | $ | (1,697,335 | ) |  | $ | (3,229,251 | ) |  | $ | (4,045,489 | )
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] |
|  | Three Months ended June 30, |  |  | Six Months ended June 30, |
|  | 201 9 |  |  | 201 8 |  |  | 201 9 |  |  | 201 8 |
Stock options |  |  | 1,551,349 |  |  |  | 1,366,467 |  |  |  | 1,784,183 |  |  |  | 1,445,891 |
Preferred stock |  |  | - |  |  |  | 1,200,767 |  |  |  | - |  |  |  | 2,853,513 |
Warrants |  |  | 3,780,976 |  |  |  | 1,398,969 |  |  |  | 3,780,976 |  |  |  | 1,398,969 |
Convertible notes |  |  | 368,952 |  |  |  | - |  |  |  | 278,243 |  |  |  | - |
Total |  |  | 5,701,277 |  |  |  | 3,966,203 |  |  |  | 5,843,402 |  |  |  | 5,698,373 |
|  | Three Months ended June 30, |  |  | Six Months ended June 30, |
|  | 201 9 |  |  | 201 8 |  |  | 201 9 |  |  | 201 8 |
Stock options |  |  | 4,071 |  |  |  | 37,015 |  |  |  | - |  |  |  | 19,863 |
Total |  |  | 4,071 |  |  |  | 37,015 |  |  |  | - |  |  |  | 19,863 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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