Note 6 - Revenue (Tables)

6 Months Ended

Jun. 30, 2022

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Well construction	$	121,794	$	-	$	233,229	$	-
Well management		191,830		176,251		360,872		332,546
Total	$	313,624	$	176,251	$	594,101	$	332,546

Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]

	June 30,		December 31,
	2022		2021
Accounts receivable, net	$	244,150	$	236,158
Unbilled receivables	$	137,014	$	94,659
Deferred revenue	$	13,001	$	17,038