Note 6 - Leases - Maturity of Operating Lease Liabilities (Details) $ in Thousands	Dec. 31, 2019 USD ($)
2020	$ 1,914	[1]
2021	1,783	[1]
2022	1,574	[1]
2023	1,355	[1]
2024	1,070
2025 and thereafter	3,789	[1]
Total future minimum lease payments	11,485	[1]
Less: Interest(2)	(1,941)	[1],[2]
Present value of operating lease liabilities(3)	$ 9,544	[1],[3]

[1] As of December 31, 2019, the total operating lease liability includes $1.0 million related to an option to extend a lease term that is reasonably certain to be exercised.

[2] Calculated using incremental borrowing interest rate for each lease.

[3] Includes the current portion of operating lease liabilities of $1.9 million as of December 31, 2019.