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Note 13 - Income Taxes (Details Textual) - USD ($) |  | 12 Months Ended
--- | --- | ---
Dec. 22, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 35.00% |  |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  |  | $ (82,900,000) |  |
Deferred Tax Assets, Valuation Allowance |  |  | 50,000 | $ 255,000 |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate |  |  | 2,600,000 | 2,400,000 |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued |  |  | 21,050 | 34,800 | $ 11,600
Unrecognized Tax Benefits, Income Tax Penalties Accrued |  |  | 0 |  |
Unrecognized Tax Benefits, Interest on Income Taxes Expense |  |  | 166,000 | $ 145,000 | $ 110,100
State and Local Jurisdiction [Member] |  |  |  |  |
Operating Loss Carryforwards |  |  | $ 44,400,000 |  |
State and Local Jurisdiction [Member] | Latest Tax Year [Member] |  |  |  |  |
Open Tax Year |  |  | 2017 |  |
State and Local Jurisdiction [Member] | Earliest Tax Year [Member] |  |  |  |  |
Open Tax Year |  |  | 2013 |  |
State and Local Jurisdiction [Member] | Deferred Tax Assets Related to Operating Loss Carryforwards [Member] |  |  |  |  |
Deferred Tax Assets, Valuation Allowance |  |  | $ 50,000 |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  |  | $ (205,000) |  |
Domestic Tax Authority [Member] | Latest Tax Year [Member] |  |  |  |  |
Open Tax Year |  |  | 2017 |  |
Domestic Tax Authority [Member] | Earliest Tax Year [Member] |  |  |  |  |
Open Tax Year |  |  | 2014 |  |
Scenario, Forecast [Member] |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 21.00% |  |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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