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Note 1 - Summary of Significant Interim Accounting Policies (Details Textual) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Mar. 01, 2018 USD ($) | Jan. 01, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jan. 03, 2017 USD ($) | Jul. 01, 2014 USD ($)
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest |  |  |  | 99.00% |  |  |  |  |  |
Amortization of Intangible Assets, Total | $ 1,000 | $ 600 |  | $ 2,900 | $ 1,700 |  |  |  |  |
Advertising Expense | 200 | 100 |  | 400 | 100 |  |  |  |  |
Selling, General and Administrative Expense, Total | 25,482 | 17,386 |  | $ 69,991 | 51,809 |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  |  |  |  |  | $ 14,300
Number of Reportable Segments |  |  |  | 3 |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total | 95,870 | 67,773 |  | $ 251,349 | 194,365 |  |  |  |  |
Revenue, Remaining Performance Obligation, Amount | 0 |  |  | 0 |  |  |  |  |  |
Contract with Customer, Asset, Net, Current, Total | 49,605 |  |  | 49,605 |  |  | $ 43,300 |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total | 2,925 |  |  | 3,715 |  |  |  |  |  |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |  |  |
Selling, General and Administrative Expense, Total |  |  |  | 706 |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total |  |  |  | $ 42,880 |  |  |  |  |  |
Cumulative Tax Adjustments Payment, Period |  |  |  | 4 years |  |  |  |  |  |
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |  |  |  |  |
Selling, General and Administrative Expense, Total | (45) |  |  | $ (67) |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total | 2,925 |  |  | 3,715 |  |  |  |  |  |
Contract with Customer, Asset, Net, Current, Total | 49,605 |  |  | 49,605 |  |  |  |  |  |
Accounting Standards Update 2014-09 [Member] | Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  |  | $ 11,200 |  |  |
Interest Rate Swap [Member] |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount | 18,000 |  |  | 18,000 |  | $ 18,000 |  |  |  |
Foreign Exchange Contract [Member] |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  |  |  |  | $ 1,800 |
Foreign Exchange Contract [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax, Total |  |  | $ 100 |  |  |  |  |  |  |
Shipping and Handling [Member] |  |  |  |  |  |  |  |  |  |
Selling, General and Administrative Expense, Total | $ 4,000 | $ 2,700 |  | $ 10,000 | $ 8,100 |  |  |  |  |

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