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Note 6 - Fair Value Measurements (Details Textual) | Jun. 30, 2020 USD ($)
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Fair Value, Inputs, Level 3 [Member] |
AOCI, Debt Securities, Available-for-sale, Adjustment, after Tax, Total | $ 825,000

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- Definition Amount, after tax, of accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e681-108580 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Data Type: | na
Balance Type: |
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