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Note 2 - Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] |
|  | Years Ended December 31,
|  | 2017 |  | 2016 |  | 2015
|  | (in thousands)
Cash paid for: |  |  |  |  |  |  |  |  |  |  |  |
Interest |  | $ | 47 |  |  | $ | 66 |  |  | $ | 86 |
Income taxes, net of refunds |  | $ | 3,878 |  |  | $ | 3,562 |  |  | $ | 1,459 |
Non-cash investing and financing activities: |  |  |  |  |  |  |  |  |  |  |  |
Capital additions accrued but not yet paid |  | $ | 85 |  |  | $ | 87 |  |  | $ | 579 |

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