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Note 3 - Recent Accounting Pronouncements (Details Textual) - USD ($) | Sep. 30, 2018 | Jan. 01, 2018 | Sep. 30, 2017
--- | --- | --- | ---
Deferred Tax Assets, Valuation Allowance, Total | $ 15,017,000 |  | $ 12,306,000
Deferred Tax Assets, Gross, Total | $ 20,974,000 |  | $ 20,637,000
Accounting Standards Update 2016-09 [Member] |  |  |
Deferred Tax Assets, Valuation Allowance, Total |  | $ 1,100,000 |
Deferred Tax Assets, Gross, Total |  | $ 1,100,000 |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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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