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Note 10 - Equity Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | For the years ended December 31 , |
(in thousands ) |  | 201 7 |  |  | 201 6 |  |  | 201 5 |
RSU expense before taxes of New Pla n |  | $ | 560 |  |  | $ | 42 |  |  | $ | - |
RSU (income) expense before taxes of Old Pla n |  |  | - |  |  |  | (73 | ) |  |  | 1,047 |
RSU (income) expense after taxe s |  |  | 636 |  |  |  | 81 |  |  |  | 631 |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] |
|  | Number of Share s |  |  | Weighted Average Estimated Fair Valu e |
Outstanding at December 31, 201 6 |  |  | 421,486 |  |  | $ | 19.93 |
Grante d |  |  | 73,021 |  |  |  | 20.01 |
Converted into share s |  |  | (25,439 | ) |  |  | 16.71 |
Forfeite d |  |  | - |  |  |  | - |
Outstanding at December 31, 201 7 |  |  | 469,068 |  |  | $ | 20.11 |
Vested at December 31, 201 7 |  |  | 403,428 |  |  | $ | 19.89 |

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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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