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Note 5 - Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2017
Notes Tables |
Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  |  |  |  |  |  |  |  |  | Weighted-average |  |  | Aggregate |
|  |  |  |  |  | Weighted-average |  |  | Remaining Contractual |  |  | Intrinsic |
|  | Shares |  |  | Exercise Price |  |  | Life (in years) |  |  | Value (in thousands) |
Balance, December 31, 2016 |  |  | 82,670 |  |  | $ | 23.37 |  |  |  | 1.1 |  |  | $ | 1,211 |
Exercised |  |  | (18,040 | ) |  |  | 23.37 |  |  |  |  |  |  |  |  |
Balance, March 31, 2017 |  |  | 64,630 |  |  | $ | 23.37 |  |  |  | 0.9 |  |  | $ | 925 |
Exercised |  |  | (19,500 | ) |  |  | 23.37 |  |  |  |  |  |  |  |  |
Balance, June 30, 2017 |  |  | 45,130 |  |  | $ | 23.37 |  |  |  | 0.7 |  |  | $ | 658 |
Exercisable, June 30, 2017 |  |  | 45,130 |  |  | $ | 23.37 |  |  |  | 0.7 |  |  | $ | 658 |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] |
|  | Units |
Balance at December 31, 2016 |  |  | 727,419 |
Granted |  |  | 164,404 |
Distributed |  |  | (297,171 | )
Forfeited |  |  | (5,362 | )
Balance at June 30, 2017 |  |  | 589,290 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited 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=96867065&loc=d3e5070-113901 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: 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=96867065&loc=d3e5070-113901 + Details
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