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Note 13 - Mezzanine Equity - Share Activity (Details) - Series D Preferred Stock [Member] - shares
3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2021
shares of Series D Preferred Stock (in shares) 22,965 22,958 22,757 22,863 22,863
Shares converted (in shares) 0 (242) (50) (354)  
Shares issued (in shares) 251 249 251 248  
shares of Series D Preferred Stock (in shares) 23,216 22,965 22,958 22,757 23,216