Note 6 - Revenue (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Year Ended December 31,
	2021		2020		2019
Well construction	$	112,126	$	-	$	-
Well management		713,636		675,026		810,064
Total	$	825,762	$	675,026	$	810,064

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

	December 31,
	2021		2020
Accounts receivable, net	$	236,158	$	159,421
Unbilled receivable	$	94,659	$	45,500
Deferred revenue	$	17,038	$	29,063