Note 14 - Financial Instruments (Details Textual) xbrli-pure in Thousands, $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Number of Derivative Instruments Held	0	0
Fair Value, Recurring [Member]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ 0	$ 0
Fair Value, Nonrecurring [Member]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ 0	$ 0