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Note 1 - Summary of Significant Interim Accounting Policies (Details Textual) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) shares | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) shares | Jun. 30, 2017 USD ($) | Mar. 31, 2018 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 | $ 1,100 | $ 600 | $ 1,800 | $ 1,100 |  |  |  |  |  |
Advertising Expense | 200 | 100 | 200 | 100 |  |  |  |  |  |
Selling, General and Administrative Expense, Total | $ 23,327 | 16,994 | $ 44,509 | 34,423 |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  |  |  |  |  | $ 14,300
Number of Reportable Segments |  |  | 3 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares | 3,497,119 |  | 3,497,119 |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total | $ 82,392 | 65,604 | $ 155,479 | 126,591 |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Amount | 0 |  | 0 |  |  |  |  |  |  |
Contract with Customer, Asset, Net, Current, Total | 46,826 |  | 46,826 |  | $ 46,800 |  | $ 43,300 |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total | (2,939) |  | 790 |  |  |  |  |  |  |
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 | (90) |  | $ (22) |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total | (2,939) |  | 790 |  |  |  |  |  |  |
Contract with Customer, Asset, Net, Current, Total | 46,826 |  | 46,826 |  |  |  |  |  |  |
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 |  | (100) |  |  |  |  |  |
Shipping and Handling [Member] |  |  |  |  |  |  |  |  |  |
Selling, General and Administrative Expense, Total | $ 3,300 | $ 2,700 | $ 6,000 | $ 5,400 |  |  |  |  |  |

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