Note 5 - Capitalized Interest (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Previously Capitalized Interest Included in Project Abandonments Costs	$ 761	$ (0)	$ (0)
Previously Capitalized Interest Included in Inventory and Land Impairment		900
Other than Temporary Impairment Losses, Investments, Total	$ 400	$ 0	$ 1,100