Note 7 - Fair Value Measurements - Change in Fair Value Measurement Impacts Net Income (Details) $ in Thousands		Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Interest Rate Contract [Member] | Valuation, Market Approach [Member] | Pull-through Rate [Member] | Minimum [Member]
Derivative asset (liability)	[1]	0.8582
Derivative asset (liability)	[1]	(0.8582)
Interest Rate Contract [Member] | Valuation, Market Approach [Member] | Pull-through Rate [Member] | Maximum [Member]
Derivative asset (liability)	[1]	1.0000
Derivative asset (liability)	[1]	(1.0000)
Interest Rate Contract [Member] | Valuation, Market Approach [Member] | Pull-through Rate [Member] | Weighted Average [Member]
Derivative asset (liability)	[1]	(0.8707)
Derivative asset (liability)	[1]	0.8707
Interest Rate Contract [Member] | Valuation, Market Approach [Member] | Current Reference Price [Member] | Minimum [Member]
Derivative asset (liability)		1.0272	1.0149
Derivative asset (liability)		(1.0272)	(1.0149)
Interest Rate Contract [Member] | Valuation, Market Approach [Member] | Current Reference Price [Member] | Maximum [Member]
Derivative asset (liability)		1.0546	1.0206
Derivative asset (liability)		(1.0546)	(1.0206)
Interest Rate Contract [Member] | Reported Value Measurement [Member]
Interest rate loan contracts			$ 1
Forward contracts		$ (21)
Interest Rate Contract [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Interest rate loan contracts			$ 1
Forward contracts		(21)
Forward Contracts [Member] | Valuation, Market Approach [Member] | Current Reference Price [Member] | Minimum [Member]
Derivative asset (liability)			1.0149
Derivative asset (liability)			(1.0149)
Forward Contracts [Member] | Valuation, Market Approach [Member] | Current Reference Price [Member] | Maximum [Member]
Derivative asset (liability)			1.0328
Derivative asset (liability)			(1.0328)
Forward Contracts [Member] | Reported Value Measurement [Member]
Interest rate loan contracts		81
Forward contracts			$ (4)
Forward Contracts [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Interest rate loan contracts		$ 81
Forward contracts			$ (4)
Forward Contract [Member] | Valuation, Market Approach [Member] | Pull-through Rate [Member] | Minimum [Member]
Derivative asset (liability)		0.8582
Derivative asset (liability)		(0.8582)
Forward Contract [Member] | Valuation, Market Approach [Member] | Pull-through Rate [Member] | Maximum [Member]
Derivative asset (liability)		1.0000
Derivative asset (liability)		(1.0000)
Forward Contract [Member] | Valuation, Market Approach [Member] | Pull-through Rate1 [Member] | Weighted Average [Member]
Derivative asset (liability)		(0.8707)
Derivative asset (liability)		0.8707
Forward Contract [Member] | Valuation, Market Approach [Member] | Current Reference Price [Member] | Minimum [Member]
Derivative asset (liability)		1.0223
Derivative asset (liability)		(1.0223)
Forward Contract [Member] | Valuation, Market Approach [Member] | Current Reference Price [Member] | Maximum [Member]
Derivative asset (liability)		1.0558
Derivative asset (liability)		(1.0558)

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