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Note 6 - Share-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2018
Notes Tables |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | (In thousands) |  |  | (In thousands) |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Stock options and SARS |  | $ | 16 |  |  | $ | 345 |  |  | $ | 960 |  |  | $ | 1,092 |
Restricted stock |  |  | 140 |  |  |  | 80 |  |  |  | 404 |  |  |  | 243 |
Performance shares |  |  | 221 |  |  |  | 121 |  |  |  | 503 |  |  |  | 319 |
Total share-based compensation expense |  | $ | 377 |  |  | $ | 546 |  |  | $ | 1,867 |  |  | $ | 1,654 |
Related income tax benefit |  | $ | 44 |  |  | $ | 29 |  |  | $ | 229 |  |  | $ | 197 |
Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | No. of |  |  | Weighted Average |
|  | Shares |  |  | Exercise Price |
Outstanding December 31, 2017 |  |  | 633,877 |  |  | $ | 13.33 |
Granted |  |  | 141,630 |  |  |  | 22.20 |
Exercised |  |  | (60,058 | ) |  |  | 10.08 |
Lapsed |  |  | (1,800 | ) |  |  | 5.88 |
Cancelled |  |  | (2,620 | ) |  |  | 20.05 |
Outstanding September 30, 2018 |  |  | 711,029 |  |  | $ | 15.36 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
|  |  |  |  |  |  |  | Weighted Average |  |  |  |  |
Range of |  |  |  |  |  | Remaining |  |  | Weighted Average |
Exercise Price |  | Shares |  |  | Contractual Life (Years) |  |  | Exercise Price |
$ 3.82 | - | $ 5.88 |  |  | 89,000 |  |  | 2.86 |  |  | $ | 5.33 |
$ 7.36 | - | $10.38 |  |  | 126,767 |  |  | 1.55 |  |  | $ | 7.85 |
$16.35 | - | $18.66 |  |  | 352,232 |  |  | 3.15 |  |  | $ | 17.49 |
$21.63 | - | $24.28 |  |  | 143,030 |  |  | 4.58 |  |  | $ | 23.03 |
$ 3.82 | - | $24.28 |  |  | 711,029 |  |  | 3.12 |  |  | $ | 15.36 |
Schedule of Share-based Compensation, Stock Appreciation Rights Award Activity [Table Text Block] |
|  | No. of |  |  | Weighted Average |
|  | Shares |  |  | Exercise Price |
Outstanding December 31, 2017 |  |  | 146,504 |  |  | $ | 17.38 |
Granted |  |  | 48,515 |  |  |  | 23.59 |
Exercised |  |  | (12,125 | ) |  |  | 17.92 |
Lapsed |  |  | - |  |  |  | - |
Cancelled |  |  | - |  |  |  | - |
Outstanding September 30, 2018 |  |  | 182,894 |  |  | $ | 18.99 |
Share-based Compensation, Activity [Table Text Block] |
|  |  |  |  |  |  |  | Weighted Average |  |  |  |  |
Range of |  |  |  |  |  | Remaining |  |  | Weighted Average |
Exercise Price |  | Shares |  |  | Contractual Life (Years) |  |  | Exercise Price |
$16.35 | - | $18.66 |  |  | 134,379 |  |  | 2.33 |  |  | $ | 17.33 |
$23.59 | - | $23.59 |  |  | 48,515 |  |  | 4.33 |  |  | $ | 23.59 |
$16.35 | - | $23.59 |  |  | 182,894 |  |  | 2.86 |  |  | $ | 18.99 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
Three months ended |  |  |  |  |  |  |  |
September 30, |  | SARS |  |  | Options |
Exercise price |  |  |  |  |  |  |  |
2018 |  |  | N/A |  |  | $ | 18.86 |
2017 |  |  | N/A |  |  | $ | 21.63 |
Market price |  |  |  |  |  |  |  |
2018 |  |  | N/A |  |  | $ | 18.86 |
2017 |  |  | N/A |  |  | $ | 21.63 |
Risk free interest rate 1 |  |  |  |  |  |  |  |
2018 |  |  | N/A |  |  |  | 2.7 | %
2017 |  |  | N/A |  |  |  | 1.8 | %
Expected award life (years) 2 |  |  |  |  |  |  |  |
2018 |  |  | N/A |  |  |  | 3 |
2017 |  |  | N/A |  |  |  | 5 |
Expected volatility 3 |  |  |  |  |  |  |  |
2018 |  |  | N/A |  |  |  | 35.4 | %
2017 |  |  | N/A |  |  |  | 37.2 | %
Expected dividend yield 4 |  |  |  |  |  |  |  |
2018 |  |  | N/A |  |  |  | 2.1 | %
2017 |  |  | N/A |  |  |  | 1.8 | %
Nine months ended |  |  |  |  |  |  |  |  |  |
September 30, |  | SARS |  |  | Options |
Exercise price |  |  |  |  |  |  |  |  |  |
2018 |  | $ | 23.59 |  |  |  | $18.86 | - | $24.28 |
2017 |  | $ | 16.97 |  |  |  | $16.97 | - | $21.63 |
Market price |  |  |  |  |  |  |  |  |  |
2018 |  | $ | 23.59 |  |  |  | $18.86 | - | $24.28 |
2017 |  | $ | 16.97 |  |  |  | $16.97 | - | $21.63 |
Risk free interest rate 1 |  |  |  |  |  |  |  |  |  |
2018 |  |  | 2.6 | % |  |  | 2.6% | - | 2.9% |
2017 |  |  | 1.9 | % |  |  | 1.8% | - | 2.4% |
Expected award life (years) 2 |  |  |  |  |  |  |  |  |  |
2018 |  |  | 3 |  |  |  | 3 | - | 10 |
2017 |  |  | 5 |  |  |  | 5 | - | 10 |
Expected volatility 3 |  |  |  |  |  |  |  |  |  |
2018 |  |  | 35.4 | % |  |  | 35.4% | - | 42.1% |
2017 |  |  | 36.6 | % |  |  | 36.6% | - | 41.4% |
Expected dividend yield 4 |  |  |  |  |  |  |  |  |  |
2018 |  |  | 1.6 | % |  |  | 1.6% | - | 2.1% |
2017 |  |  | 2.1 | % |  |  | 1.8% | - | 2.1% |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] |
|  |  |  |  |  | Weighted Average |
|  | No. of |  |  | Grant Date |
|  | Shares |  |  | Fair Value |
Outstanding December 31, 2017 |  |  | 61,378 |  |  | $ | 17.89 |
Granted |  |  | 24,908 |  |  |  | 23.56 |
Vested |  |  | - |  |  |  | - |
Forfeited |  |  | - |  |  |  | - |
Outstanding September 30, 2018 |  |  | 86,286 |  |  | $ | 19.52 |
Schedule of Nonvested Performance-based Units Activity [Table Text Block] |
|  |  |  |  |  | Weighted Average |
|  | No. of |  |  | Grant Date |
|  | Shares |  |  | Fair Value |
Outstanding December 31, 2017 |  |  | 118,492 |  |  | $ | 17.84 |
Granted |  |  | 84,838 |  |  |  | 24.56 |
Vested |  |  | - |  |  |  | - |
Forfeited |  |  | (8,952 | ) |  |  | 24.98 |
Outstanding September 30, 2018 |  |  | 194,378 |  |  | $ | 20.08 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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 (h)(1) -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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure for share-based compensation 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 (e) -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 (c)(2) -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 (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock appreciation rights awards that were outstanding at the beginning and end of the year, and the number of stock appreciation rights awards that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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://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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