Note 10 - Subsequent Events (Details Textual) - Subsequent Event [Member]	Apr. 18, 2022 shares
Conversion of Series C Preferred Stock into Common Stock [Member]
Conversion of Stock, Shares Converted (in shares)	10,000
Conversion of Stock, Shares Issued (in shares)	200
Reverse Stock Split [Member ]
Stockholders' Equity Note, Stock Split, Conversion Ratio	50
Minimum [Member] \| Reverse Stock Split [Member ]
Stockholders' Equity Note, Stock Split, Conversion Ratio	2
Maximum [Member] \| Reverse Stock Split [Member ]
Stockholders' Equity Note, Stock Split, Conversion Ratio	50

The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI https://asc.fasb.org/extlink&oid=126999549&loc=d3e4332-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration