Note 4 - Leases (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Lease, Cost [Table Text Block]

	December 31, 2020
Weighted average remaining lease term (years)		4.67
Weighted average discount rate		1.92	%

	Year ended December 31,
	2019		2020
Operating lease cost	$	2,238	$	2,587
Cash payments for operating leases	$	2,173	$	2,975

Lessee, Operating Lease, Liability, Maturity [Table Text Block]

2021		2,996
2022		2,688
2023		1,198
2024		467
2025 and thereafter		1,806
Total undiscounted cash flows		9,155
Less imputed interest		414
Present value of lease liabilities	$	8,741