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Note 12 - Income Taxes and Deferred Tax Asset/Liability - Summary Reconciliation Reported Amount of Income Tax Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Tax benefit at the U.S. federal statutory rate | $ (2,563) | $ (6,013) | $ (1,608)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 35.00% | 35.00% | 35.00%
State tax based on income, net of refunds and federal benefits | $ (113) | $ (860) | $ (155)
State tax based on income, net of refunds and federal benefits | 1.50% | 5.00% | 3.40%
Taxes on subsidiaries’ and joint ventures’ earnings allocated to noncontrolling interests owners | $ (3,786) | $ (2,620) | $ (2,365)
Taxes on subsidiaries’ and joint ventures’ earnings allocated to noncontrolling interests owners | 51.70% | 15.30% | 51.50%
Valuation allowance | $ 6,919 | $ 10,036 | $ 4,152
Valuation allowance | (94.50%) | (58.40%) | (90.40%)
Tax credits | $ (1,258) | $ (551) |
Tax credits | 17.20% | 3.20% |
Reduction of tax receivable |  |  | $ 524
Reduction of tax receivable |  |  | (11.40%)
Return to provision | $ 400 |  |
Return to provision | (5.50%) |  |
Earn-out liability | $ 433 |  |
Earn-out liability | (5.90%) |  |
Other permanent differences | $ 56 | $ 15 | $ 84
Other permanent differences | (0.80%) | (0.10%) | (1.90%)
Income tax expense | $ 88 | $ 7 | $ 632
Income tax expense | (1.30%) |  | (13.80%)

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- Definition The total tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. + References No definition available. + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to earn-out liability. + References No definition available. + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to earn-out liability. + References No definition available. + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 + Details
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