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Note 16 - Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable [Table Text Block] |
Vesting Schedule A | Vesting Schedule B | Vesting Schedule C | Vesting Schedule D
25% | 12 months | 33% | 24 months | 50% | 48 months | 20 % | 6 months
50% | 24 months | 67% | 36 months | 100% | 57 months | 40 % | 18 months
75% | 36 months | 100% | 48 months |  |  | 60 % | 30 months
100% | 48 months |  |  |  |  | 80 % | 42 months
|  |  |  |  |  | 100 % | 54 months
Share-based Compensation, Activity [Table Text Block] |
|  | December 31, 2017 |  |  | December 31, 201 6 |
|  |  |  |  |  | Weighted Avg. |  |  |  |  |  |  | Weighted Avg. |
|  | Shares |  |  | Exercise Price |  |  | Shares |  |  | Exercise Price |
Exercisable, beginning of period |  |  | 83,275 |  |  | $ | 5.20 |  |  |  | 63,800 |  |  | $ | 5.26 |
Vested |  |  | 37,138 |  |  |  | 5.70 |  |  |  | 30,381 |  |  |  | 5.22 |
Exercised |  |  | - |  |  |  | - |  |  |  | 4,906 |  |  |  | 5.15 |
Cancelled /Expired |  |  | (16,950 | ) |  |  | 5.17 |  |  |  | (6,000 | ) |  |  | 5.96 |
Exercisable at the end of period |  |  | 103,463 |  |  | $ | 5.38 |  |  |  | 83,275 |  |  | $ | 5.20 |
|  | December 31, 201 7 |  |  | December 31, 201 6 |
|  |  |  |  |  | Weighted Avg. |  |  |  |  |  |  | Weighted Avg. |
|  | Shares |  |  | Exercise Price |  |  | Shares |  |  | Exercise Price |
Outstanding, beginning of period |  |  | 143,094 |  |  | $ | 5.22 |  |  |  | 154,000 |  |  | $ | 5.25 |
Granted |  |  | 350,000 |  |  |  | 3.52 |  |  |  | - |  |  |  | - |
Exercised |  |  | - |  |  |  | - |  |  |  | 4,906 |  |  |  | 5.15 |
Cancelled /Expired |  |  | (16,950 | ) |  |  | 5.17 |  |  |  | (6,000 | ) |  |  | 5.96 |
Outstanding at the end of period |  |  | 476,144 |  |  | $ | 3.97 |  |  |  | 143,094 |  |  | $ | 5.22 |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table Text Block] |
|  | Dec 31, 2017 |  |  | Dec 31, 2016 |  |  | Dec 31, 2015 |
Weighted average fair value per warrant |  |  | - |  |  | $ | 5.85 |  |  | $ | 5.11 |
Risk-free interest rate |  |  | - |  |  |  | 1.47 | % |  |  | 1.76 | %
Expected lives (yrs.) |  |  | - |  |  |  | 3.0 |  |  |  | 4.0 |
Expected volatility |  |  | - |  |  |  | 34.03 | % |  |  | 28.99 | %

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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for exercisable or convertible options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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