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Note 6 - Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
United States | $ 39,378 | $ 36,482 | $ 37,266
Current expense: |  |  |
Federal | 16,489 | 6,960 | 11,465
Foreign | 1,243 | 547 | 292
State and local | 1,231 | 581 | 963
Total current | 18,963 | 8,088 | 12,720
Deferred expense (benefit): |  |  |
Federal | (5,968) | 3,429 | (443)
Foreign | 51 | (184) | (112)
State and local | (223) | 266 | (8)
Total deferred | (6,140) | 3,511 | (563)
Income tax expense | 12,823 | 11,599 | 12,157
UNITED STATES |  |  |
United States | 33,277 | 33,101 | 35,391
Foreign Countries [Member] |  |  |
United States | $ 6,101 | $ 3,381 | $ 1,875

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