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Note 1 - Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Summary of Valuation Allowance [Table Text Block] |
Years ended December 31: |  | Beginning balance January 1, |  |  | Additional provisions to (reversal of) allowance |  |  | Write-offs and other deductions |  |  | Ending balance December 31, |
2016 |  | $ | 1,857 |  |  | $ | (241 | ) |  | $ | (271 | ) |  | $ | 1,345 |
2015 |  | $ | 1,767 |  |  | $ | 1,100 |  |  | $ | (1,010 | ) |  | $ | 1,857 |
2014 |  | $ | 1,736 |  |  | $ | 774 |  |  | $ | (743 | ) |  | $ | 1,767 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
(in thousands except per share data) |  |  |  |  |  |  |  |  |  |  |  |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 16,835 |  |  | $ | 42,085 |  |  | $ | 17,808 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Denominator for basic income per share – weighted-average shares |  |  | 18,182 |  |  |  | 18,145 |  |  |  | 15,250 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Equivalent shares issuable upon conversion of unvested restricted shares |  |  | 84 |  |  |  | 161 |  |  |  | 266 |
Equivalent shares issuable upon conversion of unvested employee stock options |  |  | - |  |  |  | 5 |  |  |  | 1 |
Denominator for diluted income per share adjusted weighted-average shares and assumed conversions |  | $ | 18,266 |  |  | $ | 18,311 |  |  | $ | 15,517 |
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic income per share |  | $ | 0.93 |  |  | $ | 2.32 |  |  | $ | 1.17 |
Diluted income per share |  | $ | 0.92 |  |  | $ | 2.30 |  |  | $ | 1.15 |

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