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Note 10 - Income Taxes - Effective Tax Rate Analysis and Reconciliation of Expected Statutory Rate (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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 | Dec. 31, 2017
Expected income tax provision at U.S. statutory rate |  |  |  |  |  |  |  |  | $ 547 | $ 1,059 |
Increase (decrease) in tax from: |  |  |  |  |  |  |  |  |  |  |
Restricted stock |  |  |  |  |  |  |  |  | 114 | 67 |
Dividend from foreign subsidiaries |  |  |  |  |  |  |  |  | 97 | 175 |
NOL carryforwards utilized |  |  |  |  |  |  |  |  | 32 | 118 |
Global intangible low taxed income |  |  |  |  |  |  |  |  | 30 | 57 |
Nondeductible expenses |  |  |  |  |  |  |  |  | 4 | 1,466 |
Current year tax credits (foreign and research) |  |  |  |  |  |  |  |  | (234) | (553) |
Domestic tax expense (benefit), net of Federal benefit |  |  |  |  |  |  |  |  | (184) | 310 |
Section 250 foreign derived intangible income deduction |  |  |  |  |  |  |  |  | (145) | (233) |
Foreign income tax rate differences |  |  |  |  |  |  |  |  | (51) | 90 |
Changes in valuation allowance |  |  |  |  |  |  |  |  | (7) | (129) |
Effective Income Tax Rate Reconciliation, Federal Transition Tax Payable, Amount |  |  |  |  |  |  |  |  |  | (476) | $ 476
Other |  |  |  |  |  |  |  |  | 79 | 55 |
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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