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Note 14 - ATM Program (Details Textual) - Series B Preferred Stock [Member] - Public Offering [Member] - USD ($) $ in Millions | 2 Months Ended | 3 Months Ended
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Jul. 31, 2021 | Sep. 30, 2022
Stock Issued During Period, Shares, New Issues (in shares) | 3,188,533 | 8,229
Proceeds from Issuance of Preferred Stock and Preference Stock | $ 76.5 | $ 0.2

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