Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Payment, Tax Withholding, Share-based Payment Arrangement	$ 9,225	$ 5,313
Proceeds from Change in Tenants' Security Deposits	$ 890	46
Revision of Prior Period, Reclassification, Adjustment [Member]
Proceeds from (Payments for) Other Financing Activities		(5,300)
Payment, Tax Withholding, Share-based Payment Arrangement		5,300
Proceeds from Change in Tenants' Security Deposits		$ 50