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Note 1 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
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, |
201 7 |  | $ | 1,345 |  |  | $ | 454 |  |  | $ | (343 | ) |  | $ | 1,456 |
201 6 |  | $ | 1,857 |  |  | $ | (241 | ) |  | $ | (271 | ) |  | $ | 1,345 |
201 5 |  | $ | 1,767 |  |  | $ | 1,100 |  |  | $ | (1,010 | ) |  | $ | 1,857 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
(in thousands except per share data) |  |  |  |  |  |  |  |  |  |  |  |
|  | 201 7 |  |  | 2016 |  |  | 2015 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 55,439 |  |  | $ | 16,835 |  |  | $ | 42,085 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Denominator for basic income per share – weighted-average shares |  |  | 18,279 |  |  |  | 18,182 |  |  |  | 18,145 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Equivalent shares issuable upon conversion of unvested restricted shares |  |  | 93 |  |  |  | 84 |  |  |  | 161 |
Equivalent shares issuable upon conversion of unvested employee stock options |  |  | - |  |  |  | - |  |  |  | 5 |
Denominator for diluted income per share adjusted weighted-average shares and assumed conversions |  |  | 18,372 |  |  |  | 18,266 |  |  |  | 18,311 |
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic income per share |  | $ | 3.03 |  |  | $ | 0.93 |  |  | $ | 2.32 |
Diluted income per share |  | $ | 3.02 |  |  | $ | 0.92 |  |  | $ | 2.30 |

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- Definition Tabular disclosure of valuation allowances to reduce deferred tax assets to net realizable value, including identification of the deferred tax asset more likely than not will not be fully realized and the corresponding amount of the valuation allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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