Note 5 - Debt (Details Textual) - USD ($)											1 Months Ended		2 Months Ended	3 Months Ended					6 Months Ended	9 Months Ended
	Nov. 03, 2022	Sep. 22, 2022	Jul. 15, 2022	Mar. 24, 2022	Mar. 09, 2022	Apr. 26, 2021	Mar. 18, 2021	Feb. 11, 2021	Sep. 23, 2020	Aug. 10, 2017	Dec. 31, 2021	Nov. 30, 2021	May 31, 2022	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2022	Sep. 30, 2022	Sep. 30, 2021	Dec. 13, 2022	Mar. 22, 2022	Dec. 21, 2021	Nov. 12, 2021	Mar. 24, 2021	Dec. 31, 2020
Repayments of Long-term Debt, Total																				$ 43,000	$ 86,000
Long-term Debt, Total											$ 14,434,000			$ 9,290,000					$ 9,290,000	$ 9,290,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)											$ 3.57			$ 3.57					$ 3.57	$ 3.57
Proceeds from Sale of Productive Assets, Total											$ 272,000
Interest Expense, Total														$ 448,000		$ 6,000				$ 1,053,000	$ 50,000
Subsequent Event [Member] | One Parcels of Real Property in North Dakota [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Disposal Group, Including Discontinued Operation, Consideration																						$ 550,000
Heat Waves Hot Oil Service LLC at Colorado [Member]
Maximum Percentage on Advance to Accounts Receivable Factored				85.00%
Maximum Amount on Advance to Accounts Receivable Factored				$ 10,000,000.0
Receivable Fee, Percentage of Receivable Purchased in Addition to Fund Usage Daily Fee				0.10%
Funds Usage Daily Fee, Percentage				0.021%
Warrant Issued in Connection with Amended 2017 Credit Agreement [Member]
Warrants and Rights Outstanding, Term (Year)									5 years
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)									1,000,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)									$ 3.75
Warrants and Rights Outstanding									$ 1,400,000
Cross River Warrants [Member] | Subsequent Event [Member]
Warrants and Rights Outstanding, Term (Year)	5 years
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 2.11
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	568,720
Conversion from 2017 Credit Agreement Loan Concession to Common Stock [Member]
Debt Conversion, Converted Instrument, Shares Issued (in shares)									533,334
Shares Issued, Price Per Share (in dollars per share)									$ 2.0775
Debt Conversion, Converted Instrument, Amount									$ 1,100,000
Revolving Credit Facility [Member]
Long-term Debt, Total											$ 14,102,000			0					$ 0	0
Utica Leaseco, LLC [Member] | Master Lease Agreement [Member] | Heat Waves Hot Oil Service LLC at Colorado [Member]
Debt Instrument, Face Amount				$ 6,225,000
Debt Instrument, Term (Year)				51 months
Debt Instrument, Periodic Payment, Total				$ 168,075
Debt Instrument, Surcharge Percentage Per Month				1.00%
Debt Instrument, Percentage That Exceeds Prime Rate for Surcharge				0.25%
Debt Instrument, Minimum Prime Rate Percentage That Triggers Surcharge				3.25%
Debt Instrument, Covenant, Option, Payment of Lease Facility in Exchange for Reduced Payment schedule				$ 1,000,000.0
Utica Leaseco, LLC [Member] | Master Lease Agreement [Member] | Heat Waves Hot Oil Service LLC at Colorado [Member] | Minimum [Member]
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid, Percentage of Principle				1.00%
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid				$ 62,250
Utica Leaseco, LLC [Member] | Master Lease Agreement [Member] | Heat Waves Hot Oil Service LLC at Colorado [Member] | Maximum [Member]
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid, Percentage of Principle				10.00%
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid				$ 622,500
The 2017 Credit Agreement [Member] | East West Bank [Member]
Debt Instrument, Interest Rate, Stated Percentage									8.25%
Debt Instrument, Interest Rate, Calculated Monthly and Paid in Arrears									5.25%
Debt Instrument, Interest Rate, Accrued on Principal Balance									3.00%
Debt Instrument, Covenant, Minimum Liquidity																											$ 1,500,000
Debt Instrument, Covenant, Percentage of Projected Gross Revenue Achieved											80.00%	80.00%	80.00%		80.00%		70.00%		70.00%
Debt Instrument, Covenant, Maximum Capital Expenditures															$ 1,200,000
Repayments of Long-term Debt, Total								$ 3,000,000.0
Long-term Debt, Total											$ 13,500,000
Debt, Weighted Average Interest Rate											8.25%
Line of Credit Facility, Remaining Borrowing Capacity											$ 1,000,000.0
Long-term Debt, Gross											14,100,000
Interest Payable											$ 38,000
Debt Instrument, Fee Amount																									$ 70,000
Gains (Losses) on Restructuring of Debt																		$ 11,900,000
Interest Expense, Total														20,000						41,000
Unamortized Debt Issuance Expense														184,000					$ 184,000	184,000
The 2017 Credit Agreement [Member] | East West Bank [Member] | Equipment Term Loan [Member]
Debt Instrument, Face Amount									$ 17,000,000.0
The 2017 Credit Agreement [Member] | East West Bank [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity, Percent of Eligible Receivables										85.00%
Line of Credit Facility, Maximum Borrowing Capacity, Percentage of Trucks and Equipment										85.00%
Line of Credit Facility, Decrease, Forgiveness									16,000,000.0
Line of Credit Facility, Maximum Borrowing Capacity									$ 1,000,000.0	$ 37,000,000.0
Debt Instrument, Term (Year)						10 years				3 years
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage									0.50%
Debt Instrument, Covenant, Percentage of Projected Gross Revenue Achieved											80.00%	80.00%	80.00%		80.00%				70.00%
Debt Instrument, Fee Amount																									$ 70,000
The 2022 Refinancing Agreement [Member] | East West Bank [Member] | Revolving Credit Facility [Member]
Long-term Debt, Gross											$ 14,100,000
Line of Credit Facility, Fair Value of Amount Outstanding																										$ 13,800,000
Repayments of Lines of Credit							$ 8,400,000
Lines of Credit, Percentage of Net Proceeds From Receivables Financing, Payments for Refinancing.							5.00%
Lines of Credit, Value of Net Proceeds From Receivables Financing, Payments for Refinancing.							$ 1,000,000.0
Long-Term Line of Credit, Noncurrent											5,400,000
Cross River Working Capital Note [Member]
Debt Instrument, Face Amount																							$ 1,200,000
Debt Instrument, Term (Year)					6 years
Debt Instrument, Interest Rate, Stated Percentage					7.00%
Subordinated Debt with Related Party [Member]
Debt Instrument, Face Amount																								$ 220,000
Long-term Debt, Total											220,000			0					$ 0	0
Interest Payable																								10,000
Deposit Assets, Total																								$ 210,000
Interest Expense, Total														0						5,000
Repayments of Subordinated Debt, Total															$ 162,000
July 2022 Convertible Note [Member]
Debt Instrument, Face Amount														1,200,000					1,200,000	1,200,000
Debt Instrument, Interest Rate, Stated Percentage			7.75%
Long-term Debt, Total											0			$ 1,200,000					$ 1,200,000	$ 1,200,000
Proceeds from Convertible Debt			$ 1,200,000
Debt Instrument, Convertible, Conversion Price (in dollars per share)			$ 1.69											$ 1.69					$ 1.69	$ 1.69
Cross River Revolver [Member]
Long-term Debt, Total											$ 0			$ 225,000					$ 225,000	$ 225,000
Cross River Revolver [Member] | Cross River [Member]
Debt Instrument, Face Amount		$ 750,000
Debt Instrument, Term (Year)		1 year
Debt Instrument, Interest Rate, Stated Percentage		8.00%
Long-term Debt, Total														$ 225,000					$ 225,000	$ 225,000
Cross River Revolver [Member] | Cross River [Member]
Debt Instrument, Face Amount		$ 750,000
Cross River Exchange Note [Member] | Cross River [Member] | Subsequent Event [Member]
Payment of Financing and Stock Issuance Costs, Total	$ 450,000
Extinguishment of Debt, Amount	750,000
November 2022 Convertible Note [Member] | Cross River [Member] | Subsequent Event [Member]
Debt Instrument, Face Amount	$ 1,200,000
Debt Instrument, Term (Year)	2 years
Debt Instrument, Interest Rate, Stated Percentage	10.00%
Debt Instrument, Convertible, Conversion Price (in dollars per share)	$ 2.11