Goodwill & Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
INDEFINITE LIVED INTANGIBLE ASSETS:
Indefinite lived intangible assets	$ 1,741	$ 1,741
DEFINITE LIVED INTANGIBLE ASSETS:
Gross Amount	25,384	25,384
Accumulated Amortization	(15,940)	(14,571)
Net Amount	9,444	10,813
Total intangible assets, Gross Amount	27,125	27,125
Total intangible assets, Net Amount	11,185	12,554
Acquired ICFAs
DEFINITE LIVED INTANGIBLE ASSETS:
Gross Amount	17,978	17,978
Accumulated Amortization	(13,718)	(12,568)
Net Amount	4,260	5,410
Sonoran contract rights
DEFINITE LIVED INTANGIBLE ASSETS:
Gross Amount	7,406	7,406
Accumulated Amortization	(2,222)	(2,003)
Net Amount	5,184	5,403
CP Water Certificate of Convenience & Necessity service area
INDEFINITE LIVED INTANGIBLE ASSETS:
Indefinite lived intangible assets	1,532	1,532
Intangible trademark
INDEFINITE LIVED INTANGIBLE ASSETS:
Indefinite lived intangible assets	13	13
Franchise Rights [Member]
INDEFINITE LIVED INTANGIBLE ASSETS:
Indefinite lived intangible assets	129	129
Red Rock Utilities
INDEFINITE LIVED INTANGIBLE ASSETS:
Indefinite lived intangible assets	$ 67	$ 67