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Note 10 - Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | [1] | Sep. 30, 2018 | [2] | Jun. 30, 2018 | [3],[4] | Mar. 31, 2018 | [5] | Dec. 31, 2019 | Dec. 31, 2018
Current |  |  |  |  |  |  |  |  |  |
Domestic – Federal |  |  |  |  |  |  |  |  | $ 510 | $ 1,352
Domestic – state |  |  |  |  |  |  |  |  | 101 | 190
Foreign |  |  |  |  |  |  |  |  | 97 | 381
Total |  |  |  |  |  |  |  |  | 708 | 1,923
Deferred |  |  |  |  |  |  |  |  |  |
Domestic – Federal |  |  |  |  |  |  |  |  | (413) | 103
Domestic – state |  |  |  |  |  |  |  |  | (13) | (20)
Foreign |  |  |  |  |  |  |  |  |  |
Total |  |  |  |  |  |  |  |  | (426) | 83
Income tax expense | $ (76) | $ 147 | $ (113) | $ 324 | $ 295 | $ 728 | $ 382 | $ 601 | $ 282 | $ 2,006
[1] | The quarter ended December 31, 2018 includes a $2,828 increase in the fair value of contingent consideration, which was not deductible for tax purposes.
[2] | The quarter ended September 30, 2018 includes $3,057 increase in the fair value of contingent consideration, which was not deductible for tax purposes.
[3] | The quarter ended June 30, 2018 includes a $710 reduction in the fair value of contingent consideration, which was not taxable.
[4] | The quarter ended June 30, 2018 includes the reversal of certain adjustments originally recorded in the quarter ended December 31, 2017 which were related to tax legislation enacted in December 2017, as discussed in Note 10.
[5] | The quarter ended March 31, 2018 includes a $1,726 increase in the fair value of contingent consideration, which was not deductible for tax purposes.

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