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Note 8 - Equity (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Years Ended December 31,
|  | 2016 |  | 2015
Expected volatility |  | 42% | - | 45% |  | 44% | - | 50%
Expected dividends |  |  | None |  |  |  | None |
Expected term (years) |  |  | 7 |  |  | 5.5 | - | 7
Risk-free rate |  | 1.19% | - | 1.68% |  | 1.54% | - | 2.01%
Forfeiture rate |  |  | 20% |  |  |  | 20% |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Fair Value |  | Weighted Average Remaining Contractual Life
Outstanding at December 31, 2014 |  |  | 314,775 |  |  | $ | 2.23 |  |  | $ | 0.92 |  |  |  | 9.2 |
Granted at market price |  |  | 240,160 |  |  |  | 8.16 |  |  |  |  |  |  |  |  |
Exercised |  |  | (445 | ) |  |  | 1.20 |  |  |  |  |  |  |  |  |
Cancelled |  |  | (77,031 | ) |  |  | 7.88 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2015 |  |  | 477,459 |  |  | $ | 4.30 |  |  | $ | 2.01 |  |  |  | 8.7 |
Granted at market price |  |  | 660,000 |  |  |  | 3.22 |  |  |  |  |  |  |  |  |
Exercised |  |  | (37,824 | ) |  |  | 1.88 |  |  |  |  |  |  |  |  |
Cancelled |  |  | (146,560 | ) |  |  | 4.34 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2016 |  |  | 953,075 |  |  | $ | 3.66 |  |  | $ | 1.86 |  |  |  | 6.9 |
Exercisable at December 31, 2016 |  |  | 347,272 |  |  | $ | 4.07 |  |  | $ | 2.38 |  |  |  | 3.9 |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] |
Restricted Stock Awards |  | Shares
Outstanding at December 31, 2014 |  |  | 662,375 |
Restricted stock awards granted |  |  | 8,000 |
Awards forfeited or exercised |  |  | - |
Granted at December 31, 2015 |  |  | 670,375 |
Awards vested |  |  | (331,087 | )
Outstanding at December 31, 2015 |  |  | 339,288 |
Awards granted |  |  | 86,415 |
Awards vested |  |  | (162,440 | )
Awards forfeited |  |  | (170,848 | )
Outstanding at December 31, 2016 |  |  | 92,415 |
Class of Treasury Stock [Table Text Block] |
Year 1 |  | $ | 0.56 |
Year 2 |  | $ | 0.68 |
Year 3 |  | $ | 0.84 |
Year 4 |  | $ | 1.03 |
Year 5 |  | $ | 1.28 |
Year 6 |  | $ | 1.59 |
Year 7 |  | $ | 1.97 |
Year 8 |  | $ | 2.45 |
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] |
|  | Number of Units |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (in years) |  | Intrinsic Value
Outstanding at December 31, 2014 |  |  | 90,000 |  |  | $ | 8.13 |  |  |  | 3.9 |  |  |  | - |
Granted |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Outstanding at December 31, 2015 |  |  | 90,000 |  |  | $ | 8.13 |  |  |  | 2.9 |  |  | $ | - |
Granted |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Outstanding at December 31, 2016 |  |  | 90,000 |  |  | $ | 8.13 |  |  |  | 1.9 |  |  | $ | - |
Exercisable at December 31, 2016 |  |  | 90,000 |  |  | $ | 8.13 |  |  |  | 1.9 |  |  | $ | - |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + 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://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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- Definition Tabular disclosure of treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23309-112656 + Details
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