Note 10 - Segment Reporting - Reportable Segments (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenues		$ 3,109	$ 3,027	$ 15,142	$ 11,257
Cost of revenues		3,489	3,678	14,700	12,482
Segment profit (loss)		(380)	(651)	442	(1,225)
Depreciation and amortization		1,069	1,302	3,317	3,975
Capital expenditures		61	153	220	348
Identifiable assets	[1]	16,354	22,980	16,354	22,980
Production Services [Member]
Revenues		2,788	2,483	8,645	6,556
Cost of revenues		2,599	2,489	7,976	6,802
Segment profit (loss)		189	(6)	669	(246)
Depreciation and amortization		546	639	1,593	1,739
Capital expenditures		34	77	116	166
Identifiable assets	[1]	9,017	11,906	9,017	11,906
Completion Services [Member]
Revenues		321	544	6,497	4,701
Cost of revenues		890	1,189	6,724	5,680
Segment profit (loss)		(569)	(645)	(227)	(979)
Depreciation and amortization		432	562	1,440	1,935
Capital expenditures		27	68	104	174
Identifiable assets	[1]	7,131	10,460	7,131	10,460
Unallocated and Other Segments [Member]
Revenues		0	0	0	0
Cost of revenues		0	0	0	0
Segment profit (loss)		0	0	0	0
Depreciation and amortization		91	101	284	301
Capital expenditures		0	8	0	8
Identifiable assets	[1]	$ 206	$ 614	$ 206	$ 614

[1] Identifiable assets is calculated by summing the balances of accounts receivable, net; inventories; property and equipment, net; net right-of-use lease assets; assets held for sale; and other assets.