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Note 17 - Income Taxes - Summary of Components of Income Tax Expense for Continuing Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Federal | $ (117) | $ (466) | $ (844)
State | 99 | 49 | (102)
Foreign | 395 | 12 | 104
Total current income tax expense (benefit) | 377 | (405) | (842)
Federal | (2,954) | (766) | (2,883)
State | (807) | 71 | (373)
Foreign | 132 |  |
Total deferred income tax benefit | (3,629) | (695) | (3,256)
Income tax benefit | $ (3,252) | $ (1,100) | $ (4,098)

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