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Note 6 - Fair Value Measurement - Summary of the Fair Values of the Company's Derivative Instrument Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Derivative instrument asset	$ 731
Derivative instrument liability		(1,276)	[1]
Fair Value, Recurring [Member]
Derivative instrument asset	731
Total Assets	731
Derivative instrument liability		(1,276)
Total Liabilities		(1,276)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative instrument asset
Total Assets
Derivative instrument liability
Total Liabilities
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative instrument asset	731
Total Assets	731
Derivative instrument liability		(1,276)
Total Liabilities		(1,276)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Derivative instrument asset
Total Assets
Derivative instrument liability
Total Liabilities
[1] The Company has initially applied ASC 2016-02 (Topic 842) on January 1, 2019 using the modified retrospective method (note 2(v)). Under this method, the comparative information is not restated.

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