Note 5 - Discontinued Operations - Information by Major Classes of Line Items Disclosed as Discontinued Operations in the Consolidated Statements (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Total (loss) income on discontinued operations that is presented in the Statements of Operations	$ (8)	$ 36
Dillco Fluid Service, Inc [Member]
Property and equipment, net	321		$ 321
Other assets	26		32
Total major classes of assets of the discontinued operation	347		353
Accounts payable and accrued liabilities	6		6
Other liabilities	27		34
Total liabilities included as part of discontinued operations	33		$ 40
Revenue
Cost of sales	(1)
Sales, general, and administrative expenses
Depreciation and amortization	(6)	(6)
Other expense items that are not major	(1)	(12)
Pretax loss of discontinued operations related to major classes of pretax profit	(8)	(18)
Gain on disposal		54
Total (loss) income on discontinued operations that is presented in the Statements of Operations	$ (8)	$ 36