Note 1 - Basis of Presentation - Current Ownership Hierarchy (Details)	3 Months Ended
	Mar. 31, 2019
Heat Waves Hot Oil Service LLC at Colorado [Member]
Subsidiary or Equity Method Investee	100.00%
Adler Hot Oil Service, LLC [Member]
Subsidiary or Equity Method Investee	100.00%
Heat Waves Water Management LLC at Colorado [Member]
Subsidiary or Equity Method Investee	100.00%
Dillco Fluid Service, Inc. at Kansas [Member]
Subsidiary or Equity Method Investee	100.00%
HE Services LLC at Nevada [Member]
Subsidiary or Equity Method Investee	100.00%