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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Cash Reserve Deposit Required and Made | $ 2,700 |  | $ 1,900
Discounted Percentage to Account for Selling and Marketing Costs | 10.00% |  |
Accounting Standards Update 2016-02 [Member] |  |  |
Operating Lease, Right-of-Use Asset |  | $ 483 |
Operating Lease, Liability, Total |  | $ 483 |

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- Definition Discounted percentage to account for selling and marketing costs. + References No definition available. + Details
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- Definition Cash deposited in a special reserve account for the exclusive benefit of customers pursuant to SEC Regulations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=116631393&loc=SL116631396-227033 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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