Note 6 - Mezzanine Equity (Tables)

3 Months Ended

Mar. 31, 2022

Notes Tables

Schedule of Conversions of Stock [Table Text Block]

	Series D Convertible Redeemable Preferred
Total shares of Series D Preferred Stock - December 31, 2021		23,216
Conversion of Series D Preferred into Common Stock		—
Issuance of Series D Preferred as payment of dividends due		253
Total shares of Series D Preferred Stock - March 31, 2022		23,469