Note 5 - Leases (Details Textual) - USD ($) $ in Thousands		3 Months Ended
	Jan. 01, 2019	Mar. 31, 2020		Mar. 31, 2019		Dec. 31, 2019
Operating Lease, Right-of-Use Asset		$ 2,744				$ 2,863
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 2,200	277	[1]	$ 2,264	[1]
Operating Lease, Lease Income, Lease Payments		400		$ 200
Other Assets [Member]
Operating Lease, Right-of-Use Asset		2,700				2,900
Other Liabilities [Member]
Operating Lease, Liability, Total		$ 2,200				$ 2,400
Maximum [Member]
Lessee, Operating Lease, Remaining Lease Term (Year)		4 years
Lessee, Operating Lease, Renewal Term (Year)		5 years
Lessor, Remaining Lease Term (Year)		5 years
Lessor, Operating Lease, Renewal Term (Year)		5 years
Minimum [Member]
Lessee, Operating Lease, Remaining Lease Term (Year)		1 year
Lessor, Remaining Lease Term (Year)		1 year

[1] For the three months ended March 31, 2019, the amount includes $2.2 million for operating leases existing on January 1, 2019.