Note 15 - Notes Payable and Line of Credit (Details Textual) - USD ($)																	1 Months Ended					3 Months Ended			12 Months Ended
		May 31, 2023	Dec. 31, 2022	May 16, 2022	May 06, 2022	Mar. 31, 2022	Mar. 31, 2022	Dec. 20, 2021	Dec. 10, 2021	Nov. 17, 2021	Aug. 19, 2021	May 11, 2021	Mar. 23, 2021	Mar. 03, 2021	Oct. 30, 2020	Apr. 01, 2020	Nov. 30, 2023	Nov. 30, 2022	Feb. 28, 2022	Nov. 30, 2021	Aug. 31, 2021	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020	Mar. 29, 2022	Sep. 30, 2021
Debt Instrument, Face Amount						$ 105,000	$ 105,000															$ 105,000
Long-term Debt, Total						221,977,000	221,977,000															221,977,000	$ 229,379,000
Long-Term Debt, Gross						233,020,000	$ 233,020,000															233,020,000	241,982,000
Gain (Loss) on Extinguishment of Debt, Total																						(26,019,000)		$ (250,000)
Fluctuation in Share Price (in dollars per share)							$ 0.01
Line of Credit [Member] | GTS Subsidiary [Member]
Line of Credit Facility, Maximum Borrowing Capacity											$ 4,000,000.0
Long-Term Line of Credit, Total						4,000,000.0	$ 4,000,000.0															4,000,000.0
Line of Credit Facility, Remaining Borrowing Capacity						0	0															0
Exchange Agreement to Reduce Principal on Seller-financed Note Payable [Member]
Debt Conversion, Converted Instrument, Shares Issued (in shares)																					155,763
Debt Conversion, Original Debt, Amount																					$ 1,000,000
Seller Financed Notes Payable, Two [Member]
Long-term Debt, Total																									$ 1,500,000
Unsecured Debt [Member] | Streeterville Capital, LLC [Member]
Debt Instrument, Face Amount													$ 10,700,000
Debt Instrument, Periodic Payment, Total													$ 1,000,000
Debt Instrument, Interest Rate, Effective Percentage													19.60%
Debt Instrument, Interest Rate, Stated Percentage													9.00%
Debt Instrument, Term (Month)													18 months
Debt Instrument, Unamortized Discount, Total													$ 1,000,000.0
Long-Term Debt, Gross						$ 4,500,000	$ 4,500,000															$ 4,500,000
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] | Line of Credit [Member] | GTS Subsidiary [Member]
Debt Instrument, Basis Spread on Variable Rate											2.05%
Unsecured Promissory Note With Kurt A Johnson [Member]
Debt Instrument, Face Amount										$ 34,256,000
Unsecured Promissory Note With Tidal Power Group [Member]
Debt Instrument, Face Amount										$ 51,384,000
Debt Instrument, Interest Rate, Stated Percentage										6.00%
Debt Instrument, Share Price Covenant (in dollars per share)						$ 4.00	$ 4.00															$ 4.00
Payments for Additional Consideration																						$ 28,852,844
Unsecured Promissory Note With Tidal Power Group [Member] | Forecast [Member]
Repayments of Debt		$ 52,000,000	$ 15,000,000
Unsecured Promissory Note With Tidal Power Group [Member] | Subsequent Event [Member]
Repayments of Debt					$ 20,000,000
Unsecured Promissory Note With Kurt A Johnson 2 [Member]
Debt Instrument, Face Amount									$ 1,090,000
Debt Instrument, Interest Rate, Stated Percentage									6.00%
Reduction in Stock Shares in Exchange for Debt (in shares)									400,000
Debt Instrument, Share Price Covenant (in dollars per share)						$ 4.00	$ 4.00															$ 4.00
Payments for Additional Consideration																						$ 17,635,228
Seller Financed Notes Payable, One [Member]
Debt Instrument, Interest Rate, Stated Percentage																					6.00%
Repayments of Debt														$ 1,000,000
Debt Instrument, Term (Month)																									18 months
Long-term Debt, Total																									$ 5,000,000		$ 5,000,000
August 2021 Seller-financed Notes Payable [Member]
Debt Instrument, Face Amount																					$ 2,000,000.0
Debt Instrument, Interest Rate, Stated Percentage																					6.00%
Estimated Market Interest Rate on Which Debt Instrument is Based																					10.00%
Debt Instrument, Unamortized Discount, Total																					$ 48,000
Seller Financed Notes Payable, Two [Member]
Debt Instrument, Term (Month)																36 months
Vehicle and Equipment loans [Member]
Long-Term Debt, Gross	[1]					$ 1,268,000	$ 1,268,000															1,268,000	$ 222,000
Vehicle and Equipment loans [Member] | Minimum [Member]
Debt Instrument, Interest Rate, Stated Percentage																							1.00%
Vehicle and Equipment loans [Member] | Maximum [Member]
Debt Instrument, Interest Rate, Stated Percentage																							9.15%
The Investor Note [Member]
Long-Term Debt, Gross	[2]					29,086,000	$ 29,086,000															$ 29,086,000	$ 33,922,000
Conditional Settlement Agreement [Member]
Debt Instrument, Interest Rate, Stated Percentage															0.00%
Repayments of Debt						$ 350,000													$ 150,000				500,000
Debt Instrument, Term (Month)															3 years
Long-term Debt, Total															$ 3,500,000
Conditional Settlement Agreement [Member] | Forecast [Member]
Repayments of Debt																	$ 1,500,000	$ 1,000,000
Seller Financed Notes Payable - Front Line Power Acquisition [Member]
Debt Instrument, Share Price Covenant (in dollars per share)						$ 4.00	$ 4.00															$ 4.00
Long-Term Debt, Gross	[3]					$ 86,730,000	$ 86,730,000															$ 86,730,000	$ 86,730,000
Gain (Loss) on Extinguishment of Debt, Total																						$ (25,300,000)
Seller Financed Notes Payable - Front Line Power Acquisition [Member] | Put Option [Member]
Option Contract Indexed to Equity, Settlement, Share, Fair Value																										$ 25,900,000
Seller Financed Notes Payable - Front Line Power Acquisition [Member] | Subsequent Event [Member]
Debt Instrument, Periodic Payment, Total				$ 35,000,000
Alter Domus and Various Lenders [Member] | Financing Acquisition Term Loan [Member]
Debt Instrument, Face Amount										$ 105,000,000
Debt Instrument, Periodic Payment, Total										$ 262,500
Debt Instrument, Initial Prepayment Premium, Percentage										5.00%
Debt Instrument, Final Prepayment Premium, Percentage										1.00%
Debt Instrument, Interest Rate, Effective Percentage						13.50%	13.50%															13.50%
Alter Domus and Various Lenders [Member] | Financing Acquisition Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate										2.50%
First Insurance Funding [Member]
Debt Instrument, Term (Month)																						10 months
First Insurance Funding [Member] | First and Second Financing Note [Member]
Debt Instrument, Interest Rate, Stated Percentage						4.35%	4.35%															4.35%
First Insurance Funding [Member] | Third Financing Note [Member]
Debt Instrument, Interest Rate, Stated Percentage						3.00%	3.00%															3.00%
C6 Capital [Member] | Future Revenue Payable Two [Member]
Debt Instrument, Face Amount																				$ 9,500,000
Debt Instrument, Periodic Payment, Total																				384,000
Long-term Debt, Total						$ 3,800,000	$ 3,800,000															$ 3,800,000
Debt Instrument, Unamortized Discount, Total																				2,600,000
Proceeds from Issuance of Long-term Debt, Total																				$ 6,900,000
Debt Instrument, Effective Interest Rate for Discount Amortization																				89.00%
Long-Term Debt, Gross						4,200,000	4,200,000															4,200,000
C6 Capital [Member] | Future Revenue Payable One [Member]
Debt Instrument, Periodic Payment, Total																				$ 148,000
Streeterville Capital, LLC [Member] | The Investor Note [Member]
Debt Instrument, Face Amount												$ 10,700,000
Debt Instrument, Periodic Payment, Total												$ 1,000,000
Debt Instrument, Interest Rate, Stated Percentage												9.00%
Debt Instrument, Term (Month)												18 months
Debt Instrument, Unamortized Discount, Total												$ 1,000,000.0
Long-Term Debt, Gross						7,800,000	7,800,000															7,800,000
Streeterville Capital, LLC [Member] | The Fourth Investor Note [Member]
Debt Instrument, Face Amount								$ 16,100,000
Debt Instrument, Periodic Payment, Total								$ 1,500,000
Debt Instrument, Interest Rate, Effective Percentage								16.30%
Debt Instrument, Interest Rate, Stated Percentage								9.00%
Debt Instrument, Term (Month)								18 years
Debt Instrument, Unamortized Discount, Total								$ 1,100,000
Long-Term Debt, Gross						$ 15,700,000	$ 15,700,000															15,700,000
Gain (Loss) on Extinguishment of Debt, Total																						$ (700,000)

[1] Includes vehicle and equipment loans with interest rates ranging from 1.00% to 9.15%.

[2] On March 23, 2021, the Company completed a note payable agreement with an institutional investor with a face amount of $10.7 million, a stated interest rate of 9.0%, an estimated effective interest rate of 19.6%, and an original issue discount of $1.0 million. The carrying value was $4.5 million at March 31, 2022. The note payable is payable within eighteen (18) months after the purchase date and the creditor may request payment of up to $1 million per calendar month beginning 6 months after initial issuance. On May 11, 2021, the Company completed note payable agreement with the institutional investor with a face amount of $10.7 million, a stated interest of 9.0% per annum and a combined original issue discount and unamortized prepaid fees of $1.0 million and a carrying value of $7.8 million at March 31, 2022. The net proceeds were to be used for working capital, future acquisitions and general corporate purposes. Beginning six (6) months from the purchase price date, investor has the right, in its sole and absolute discretion, to redeem all or any portion of the Note (such amount, the “Redemption Amount”) subject to the maximum monthly redemption amount of $1 million per calendar month, by providing Company with a “Redemption Notice," and is payable in full within 18 months of issuance. On December 20, 2021, the Company completed a note payable agreement with the institutional investor with a face amount of $16.1 million, a stated interest rate of 9.0%, an estimated effective interest rate of 16.3%, and an original issue discount of $1.1 million. The note payable is payable within eighteen (18) months after the purchase date and the creditor may request payment of up to $1.5 million per month beginning 6 months after initial issuance. The carrying value was $15.7 million at March 31, 2022. The Company has not made any payments on this note as of March 31, 2022. For payments made by exchanging stock for payments against the debt in 2022, the Company recorded a total loss of $0.7 million on the exchanges due to the Company issuing shares at a lower price than the current market price on the dates of exchange.

[3] On November 17, 2021, the Company entered into two unsecured promissory notes, one with Kurt A Johnson, Jr, for $34,256,000 and the second for $51,384,000 with Tidal Power Group LLC. These promissory notes bear an interest rate of 6% per annum and as modified, $20 million is due on May 6, 2022, $15 million is due on December 31, 2022, and $52 million is due on May 31, 2023. On December 10, 2021, Kurt A Johnson Jr. received an additional unsecured promissory note in the principal sum of $1,090,000 also with a 6% per annum interest rate in exchange for a reduction of shares issued to Mr. Johnson of 400,000. Additionally in a Q1 2022 amendment to the note, the Company also agreed to reduce the restriction period under the Tidal Lockup letter from two years to one year and to the extent that if the value of the shares previously issued to Tidal Power were less than $4.00 per share upon expiration of the restriction period, the Company has agreed to pay additional consideration to Tidal Power so that the value of Tidal Power's shares are equal to no less than $28,852,844. For the Johnson lockup letter, the Company agreed to pay additional consideration to Mr. Johnson upon expiration of the restriction period so that the value of his stock consideration is no less than $17,635,228, which is equal to $4.00 per common share. Any shortfall would be made up by issuing Mr. Johnson additional common shares. See Subsequent Event footnote 20 for more information on amendments to these Promissory notes. See Debt modification subheading below for more information on the debt modification of the unsecured promissory notes.