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Note 1 - Basis of Presentation (Details Textual) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 shares | Jun. 30, 2019 shares | Jun. 30, 2020 USD ($) shares
Number of Entities Consolidated as Variable Interest Entities | 3 |  | 3
Deconsolidation, Gain (Loss), Amount | $ |  |  | $ 219,000
Convertible Preferred Stock, Shares to be Issued Upon Conversion (in shares) | 5,908,600 |  | 5,908,600
Number of Shares Issuable Upon the Exercise of Options and Warrants (in shares) | 792,660 | 471,144 | 792,660
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | 0 | 0 |

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- Definition Represents the number of entities consolidated as variable interest entities (VIE's) as of the balance sheet date. + References No definition available. + Details
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- Definition The number of shares issuable upon the exercise of options and warrants aggregated. + References No definition available. + Details
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Amount of gain (loss) from deconsolidation of subsidiary and derecognition of group of assets constituting transfer of business or nonprofit activity, excluding conveyance of oil and gas mineral rights and transfer of good or service in contract with customer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4582445-111684 + Details
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