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Note 11 - Stockholders’ Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
Stockholders' Equity Note [Abstract] |
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] | Following is a summary of the warrant activity for the years ended December 31, 2018:
|  | Number of Warrants |  |  | Average Exercise Price |  |  | Weighted Average Remaining Contractual Term in Years |
Outstanding at January 1, 2018 |  |  | 858,334 |  |  | $ | 2.71 |  |  |  | 2.92 |
Exercisable at January 1, 2018 |  |  | 858,334 |  |  |  | 2.71 |  |  |  | 2.92 |
Granted |  |  | - |  |  |  | - |  |  |  | - |
Exercised / surrendered |  |  | - |  |  |  | - |  |  |  | - |
Expired |  |  | - |  |  |  | - |  |  |  | - |
Outstanding at December 31, 2018 |  |  | 858,334 |  |  | $ | 2.71 |  |  |  | 1.92 |
Exercisable at December 31, 2018 |  |  | 858,334 |  |  | $ | 2.71 |  |  |  | 1.92 |
Share-based Compensation, Stock Options, Activity [Table Text Block] | Stock option activity under the Company’s stock-based compensation plans is shown below:
|  | Number of Shares |  |  | Average Exercise Price per Share |  |  | Aggregate Intrinsic Value(1) |  |  | Weighted Average Remaining Contractual Term in Years |
Outstanding at January 1, 2018 |  |  | 1,072,500 |  |  |  | 1.37 |  |  | $ |  |  |  |  | 4.67 |
Exercisable at January 1, 2018 |  |  | 532,500 |  |  |  | 1.37 |  |  | $ |  |  |  |  | 4.67 |
Granted |  |  | 335,000 |  |  |  | 1.25 |  |  |  |  |  |  |  | 5.00 |
Exercised |  |  | (40,000 | ) |  |  | 1.26 |  |  |  |  |  |  |  |  |
Forfeited |  |  | - |  |  |  | - |  |  |  |  |  |  |  | - |
Outstanding at December 31, 2018 |  |  | 1,367,500 |  |  | $ | 1.34 |  |  | $ | - |  |  | $ | 3.96 |
Exercisable at December 31, 2018 |  |  | 1,125,000 |  |  | $ | 1.37 |  |  | $ | - |  |  | $ | 3.75 |
(1) | The intrinsic value of the stock options at December 31, 2018 is the amount by which the market value of the Company’s common stock of $0.46 as of December 31, 2018 exceeds the exercise price of the option.

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666 + Details
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