Note 4 - Fair Value Measurements - Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
GIC	$ 65	$ 64
Guaranteed Investment Certificates [Member]
GIC	65	64
Fair Value, Inputs, Level 1 [Member]
GIC	0	0
Fair Value, Inputs, Level 1 [Member] | Guaranteed Investment Certificates [Member]
GIC	0	0
Fair Value, Inputs, Level 2 [Member]
GIC	65	64
Fair Value, Inputs, Level 2 [Member] | Guaranteed Investment Certificates [Member]
GIC	65	64
Fair Value, Inputs, Level 3 [Member]
GIC	0	0
Fair Value, Inputs, Level 3 [Member] | Guaranteed Investment Certificates [Member]
GIC	$ 0	$ 0