Note 11 - Net Income Attributable to Controlling Interests Per Common Share (Details Textual) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Weighted Average Number of Shares, Unvested Share-based Payment Awards, Basic (in shares)	153,650	430,413	127,138	426,050
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	100,000	0.0	0.0	100,000
Five Point Eight Seven Five Percent Convertible Senior Notes Due Two Thousand Thirty Five [Member]
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities (in shares)		200,000		200,000
Series A Preferred Stock [Member]
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock (in shares)	4,000,000.0	4,000,000.0	4,000,000.0	4,000,000.0