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Note 4 - Supplemental Cash Flow Information (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Income Taxes Paid |  |  | $ 5,220,000 | $ 3,927,000
Interest Paid |  |  | $ 523,000 | $ 512,000
Company Stock Received in Lieu of Cash Stock Options Exercised | 0 | 2,164 | 43,841 | 12,598
Stock Issued During Period, Shares, New Issues | 0 | 5,568 | 113,143 | 35,984

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