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Note 10 - Loss / (Gain) Per Common Share - Antidilutive Securities Excluded from the Diluted per Share Calculation (Details) - shares	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Potentially dilutive securities (in shares)	11,982,979	1,291,855
Warrant [Member] | Class B Warrants [Member]
Potentially dilutive securities (in shares)	0	480,000
Series E Convertible Preferred Stock [Member]
Potentially dilutive securities (in shares)	11,982,979	811,855

X

- 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=124432515&loc=d3e3550-109257

+ Details

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- Details

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- Details

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