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Note 3 - Real Estate (Details Textual)
$ in Millions
3 Months Ended
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, Net of Tax, Attributable to Noncontrolling Interest   $ 3.0
Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation   $ 1.0
Property Held-for-sale, Net Carrying Amount $ 13.7  
Parcels in San Marcos, CA and Columbia, MD [Member]    
Number of Parcels Acquired 2  
Payments to Acquire Real Estate, Total $ 18.6