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Note 4 - Supplemental Cash Flow Information (Details Textual) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 01, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Mar. 31, 2018 | Dec. 31, 2017
Income Taxes Paid |  |  |  | $ 700 | $ 3,700 |  |
Interest Paid, Excluding Capitalized Interest, Operating Activities |  |  |  | $ 800 | $ 300 |  |
Company Stock Received in Lieu of Cash Stock Options Exercised |  | 1,031 | 27,341 | 6,894 | 43,841 |  |
Stock Issued During Period, Shares, New Issues |  | 6,000 | 71,599 | 26,234 | 113,143 |  |
Contract with Customer, Asset, Net, Current, Total | $ 43,300 | $ 46,826 |  | $ 46,826 |  | $ 46,800 |
Increase (Decrease) in Inventories, Total |  |  |  | $ (2,953) | $ (1,632) |  |
CID Resources [Member] |  |  |  |  |  |  |
Noncash or Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration, Shares Issued |  |  |  | 150,094 |  |  |
Stock Issued |  |  |  | $ 3,800 |  |  |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |
Increase (Decrease) in Inventories, Total | (24,900) |  |  |  |  |  |
Increase (Decrease) in Accounts Payable, Total | 2,600 |  |  |  |  |  |
Increase (Decrease) in Other Current Liabilities | 1,100 |  |  |  |  |  |
Increase (Decrease) in Deferred Income Taxes | $ (3,500) |  |  |  |  |  |

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