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Note 1 - Summary of Significant Accounting Policies - Compensation Cost Charged Against Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Selling, General and Administrative Expenses [Member] |  |  |
Share-based compensation expense | $ 1,212 | $ 1,068 | $ 1,056

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