Note 7 - Fair Value Measurements - Interest Rate Loan Contracts and Forward Contracts Fair Value Measurement (Details) $ in Thousands		Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Interest Rate Contract [Member] | Valuation, Market Approach [Member] | Pull-through Rate1 [Member]
Derivative asset (liability)	[1]	0.9
Derivative asset (liability)	[1]	(0.9)
Interest Rate Contract [Member] | Valuation, Market Approach [Member] | Pull-through Rate [Member]
Derivative asset (liability)	[1]		0.9
Derivative asset (liability)	[1]		(0.9)
Interest Rate Contract [Member] | Valuation, Market Approach [Member] | Current Reference Price [Member] | Minimum [Member]
Derivative asset (liability)		98.4	1.0149
Derivative asset (liability)		(98.4)	(1.0149)
Interest Rate Contract [Member] | Valuation, Market Approach [Member] | Current Reference Price [Member] | Maximum [Member]
Derivative asset (liability)		100.51	1.0206
Derivative asset (liability)		(100.51)	(1.0206)
Interest Rate Contract [Member] | Valuation, Market Approach [Member] | Current Reference Price [Member] | Weighted Average [Member]
Derivative asset (liability)	[2]	(99.62)	1.0172
Derivative asset (liability)	[2]	99.62	(1.0172)
Interest Rate Contract [Member] | Reported Value Measurement [Member]
Interest rate loan contracts		$ (25)
Forward contracts			$ 1
Interest Rate Contract [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Interest rate loan contracts
Forward contracts
Interest Rate Contract [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Interest rate loan contracts
Forward contracts
Interest Rate Contract [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Interest rate loan contracts		$ (25)
Forward contracts			$ 1
Forward Contracts [Member] | Valuation, Market Approach [Member] | Pull-through Rate [Member]
Derivative asset (liability)	[1]	65.6	0.656
Derivative asset (liability)	[1]	(65.6)	(0.656)
Forward Contracts [Member] | Valuation, Market Approach [Member] | Current Reference Price [Member] | Minimum [Member]
Derivative asset (liability)		98.4	1.0149
Derivative asset (liability)		(98.4)	(1.0149)
Forward Contracts [Member] | Valuation, Market Approach [Member] | Current Reference Price [Member] | Maximum [Member]
Derivative asset (liability)		100.51	1.0328
Derivative asset (liability)		(100.51)	(1.0328)
Forward Contracts [Member] | Valuation, Market Approach [Member] | Current Reference Price [Member] | Weighted Average [Member]
Derivative asset (liability)	[2]	(99.91)	1.0191
Derivative asset (liability)	[2]	99.91	(1.0191)
Forward Contracts [Member] | Reported Value Measurement [Member]
Interest rate loan contracts			$ (4)
Forward contracts		$ 18
Forward Contracts [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Interest rate loan contracts
Forward contracts
Forward Contracts [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Interest rate loan contracts
Forward contracts
Forward Contracts [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Interest rate loan contracts			$ (4)
Forward contracts		$ 18

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

[2] Current reference prices were weighted by the relative amount of the loan