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Note 1 - Summary of Significant Interim Accounting Policies (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Jun. 30, 2017 | Jan. 03, 2017 | Jul. 01, 2014
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest |  |  | 99.00% |  |  |  |
Amortization of Intangible Assets | $ 570,000 | $ 607,000 | $ 1,711,000 | $ 1,761,000 |  |  |
Advertising Expense | $ 14,000 | 23,000 | $ 53,000 | 55,000 |  |  |
Derivative, Notional Amount |  |  |  |  |  |  | $ 14,250,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 3,659,877 |  | 3,659,877 |  |  |  |
Income Tax Expense (Benefit) | $ 1,880,000 | $ 1,559,000 | $ 4,810,000 | $ 3,834,000 |  |  |
Earnings Per Share, Basic | $ 0.34 | $ 0.31 | $ 0.91 | $ 0.73 |  |  |
Earnings Per Share, Diluted | $ 0.33 | $ 0.30 | $ 0.87 | $ 0.69 |  |  |
Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |
Income Tax Expense (Benefit) | $ (97,000) | $ (60,000) | $ (725,000) | $ (476,000) |  |  |
Earnings Per Share, Basic | $ 0.01 | $ 0.01 | $ 0.05 | $ 0.04 |  |  |
Earnings Per Share, Diluted | $ 0.01 | $ 0.01 | $ 0.05 | $ 0.04 |  |  |
Interest Rate Swap [Member] |  |  |  |  |  |  |
Derivative, Notional Amount | $ 18,000,000 |  | $ 18,000,000 |  |  |  |
Interest Rate Swap [Member] | Other Current Liabilities [Member] |  |  |  |  |  |  |
Derivative Liability | 261,000 |  | 261,000 |  |  |  |
Foreign Exchange Contract [Member] |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  | $ 1,800,000 |
Foreign Exchange Contract [Member] | Other Current Liabilities [Member] |  |  |  |  |  |  |
Derivative Liability |  |  |  |  | $ 92,000 |  |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |
Shipping, Handling and Transportation Costs | $ 2,664,000 | $ 2,646,000 | $ 8,103,000 | $ 7,798,000 |  |  |

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