Note 11 - Segment Reporting - Revenues by Geography (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Revenue		$ 5,143	$ 9,386
Production Services [Member]
Revenue		1,844	3,202
Completion Services [Member]
Revenue		3,299	6,184
Rocky Mountain Region [Member] | Production Services [Member]
Revenue	[1]	444	1,193
Rocky Mountain Region [Member] | Completion Services [Member]
Revenue	[1]	1,952	5,006
Central USA Region [Member] | Production Services [Member]
Revenue	[2]	1,240	1,873
Central USA Region [Member] | Completion Services [Member]
Revenue	[2]		110
Eastern USA Region [Member] | Production Services [Member]
Revenue	[3]	160	136
Eastern USA Region [Member] | Completion Services [Member]
Revenue	[3]	$ 1,347	$ 1,068

[1] Includes the D-J Basin/Niobrara field (northeastern Colorado and southeastern Wyoming), the San Juan Basin (southeastern Colorado and northeastern New Mexico, the Powder River and Green River Basins (northeastern and southwestern Wyoming), the Bakken area (western North Dakota and eastern Montana).

[2] Includes the Scoop/Stack Shale in Oklahoma and the Eagle Ford Shale in Texas.

[3] Consists of the southern region of the Marcellus Shale formation (southwestern Pennsylvania and northern West Virginia) and the Utica Shale formation (eastern Ohio).