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Note 15 - Stockholders' Equity - Preferred Stock Repurchased (Details) - USD ($)	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Purchase price	$ 1,491,000	$ 3,441,000
Class L Cumulative Redeemable Preferred Stock Depositary Shares[Member]
Shares repurchased (in shares)	43,777
Purchase price	$ 973,400
Class M Cumulative Redeemable Preferred Stock Depositary Shares [Member]
Shares repurchased (in shares)	23,791
Purchase price	$ 515,900

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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