Note 3 - Fair Value of Financial Instruments - Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Derivative Assets (Liabilities), at Fair Value, Net, Total	$ (2,055)	$ (3,106)	[1]
Fair Value of Securities	1,541	1,310
Fair Value, Inputs, Level 1 [Member]
Derivative Assets (Liabilities), at Fair Value, Net, Total	0	0	[1]
Fair Value of Securities	1,541	1,310
Fair Value, Inputs, Level 2 [Member]
Derivative Assets (Liabilities), at Fair Value, Net, Total	(2,055)	(3,106)	[1]
Fair Value of Securities	0	0
Fair Value, Inputs, Level 3 [Member]
Derivative Assets (Liabilities), at Fair Value, Net, Total	0	0	[1]
Fair Value of Securities	$ 0	$ 0

[1] Includes derivative assets of $122 at December 31, 2020.