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Note 13 - Income Taxes (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Deferred Tax Assets, Valuation Allowance | $ 255,000 | $ 452,000 |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 2,400,000 | 2,300,000 |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued | 34,800 | 11,600 | $ 17,500
Unrecognized Tax Benefits, Interest on Income Taxes Expense | 145,000 | $ 110,100 | $ 98,500
State and Local Jurisdiction [Member] |  |  |
Operating Loss Carryforwards | $ 44,600,000 |  |
State and Local Jurisdiction [Member] | Earliest Tax Year [Member] |  |  |
Open Tax Year | 2012 |  |
State and Local Jurisdiction [Member] | Latest Tax Year [Member] |  |  |
Open Tax Year | 2016 |  |
State and Local Jurisdiction [Member] | Deferred Tax Assets Related to Operating Loss Carryforwards [Member] |  |  |
Deferred Tax Assets, Valuation Allowance | $ 255,000 |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 197,000 |  |
Domestic Tax Authority [Member] | Earliest Tax Year [Member] |  |  |
Open Tax Year | 2013 |  |
Domestic Tax Authority [Member] | Latest Tax Year [Member] |  |  |
Open Tax Year | 2016 |  |

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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=65882285&loc=d3e32537-109319 + Details
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- Definition Tax year that remains open to examination under enacted tax laws, in CCYY format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 + Details
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- Definition Amount of interest expense accrued for an underpayment of income taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 + Details
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=75116654&loc=d3e32123-109318 + Details
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