Note 6 - Fair Value Measurements - Change in Fair Value Measurement Impacts Net Income (Details) - Valuation, Market Approach [Member]	Mar. 31, 2022
Pull-through Rate [Member] | Maximum [Member] | Interest Rate Contract [Member]
Derivative asset (liability)	0.9016	[1]
Pull-through Rate [Member] | Maximum [Member] | Forward Contract [Member]
Derivative asset (liability)	0.9016	[1]
Current Reference Price [Member] | Maximum [Member] | Interest Rate Contract [Member]
Derivative asset (liability)	1.0111
Current Reference Price [Member] | Maximum [Member] | Forward Contract [Member]
Derivative asset (liability)	1.0111
Current Reference Price [Member] | Minimum [Member] | Interest Rate Contract [Member]
Derivative asset (liability)	0.9957
Current Reference Price [Member] | Minimum [Member] | Forward Contract [Member]
Derivative asset (liability)	0.9957
Current Reference Price [Member] | Weighted Average [Member] | Interest Rate Contract [Member]
Derivative asset (liability)	(0.9991)
Current Reference Price [Member] | Weighted Average [Member] | Forward Contract [Member]
Derivative asset (liability)	(0.9991)

[1] All contracts are valued using the same pull-through rate.