Note 17 - Business Combinations (Details Textual) - USD ($)						1 Months Ended	2 Months Ended	5 Months Ended	9 Months Ended	12 Months Ended
	Mar. 07, 2022	Nov. 17, 2021	Oct. 22, 2021	Jul. 28, 2021	Apr. 13, 2021	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2022	Mar. 31, 2022
Goodwill, Ending Balance						$ 100,899,000	$ 100,899,000	$ 100,899,000	$ 100,899,000	$ 100,899,000	$ 7,006,000
Long-term Debt, Total						229,379,000	229,379,000	229,379,000	229,379,000	229,379,000	$ 245,236,000
Unsecured Promissory Note With Tidal Power Group [Member]
Debt Instrument, Interest Rate, Stated Percentage		6.00%
Coax Fiber Solutions (CFS) [Member]
Goodwill, Ending Balance												$ 1,500,000
Front Line Power Construction, LLC [Member]
Payments to Acquire Businesses, Gross		$ 101,536,000
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable		17,612,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total		18,730,000
Goodwill, Ending Balance		70,151,000
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual						9,200,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual						$ 98,000
Business Combination, Acquisition Related Costs		230,000
Business Combination, Consideration Transferred, Total		219,241,000
Business Combination, Working Capital Adjustment		14,092,000
Front Line Power Construction, LLC [Member] | Front Line Power Seller Notes [Member]
Proceeds from Issuance of Debt		$ 105,000,000
Front Line Power Construction, LLC [Member] | Unsecured Promissory Note With Tidal Power Group [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)		11,622,018
Long-term Debt, Total		$ 86,700,000
Long-Term Debt, Fair Value		$ 86,000,000.0
Debt Instrument, Interest Rate, Stated Percentage		6.00%
Front Line Power Construction, LLC [Member] | Payments of Indebtedness [Member]
Payments to Acquire Businesses, Gross		$ 1,000,000.0
Front Line Power Construction, LLC [Member] | Transaction Expense [Member]
Payments to Acquire Businesses, Gross		$ 4,400,000
Full Moon [Member]
Payments to Acquire Businesses, Gross			$ 1,200,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)			227,974
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable			$ 368,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total			124,000
Goodwill, Ending Balance			826,000
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual							1,000,000.0
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual							$ 300,000
Business Combination, Consideration Transferred, Total			$ 2,000,000.0
Business Acquisition, Percentage of Voting Interests Acquired			100.00%
Business Acquisition, Share Price (in dollars per share)			$ 1.614
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred			$ 381,000
IMMCO, Inc. [Member]
Payments to Acquire Businesses, Gross				$ 16,597,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)				874,317
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable				$ 2,024,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total				760,000
Goodwill, Ending Balance				11,114,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities, Total				2,100,000
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual								3,700,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual								$ 2,800,000
Business Combination, Consideration Transferred, Total				19,100,000
Payments to Acquire Businesses, Before Working Capital Adjustments				16,000,000
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Fair Value				2,500,000
Business Combination, Working Capital Adjustment				$ 600,000
IMMCO, Inc. [Member] | Selling, General and Administrative Expenses [Member]
Business Combination, Acquisition Related Costs										600,000
Gibson Technical Services, Inc. [Member]
Payments to Acquire Businesses, Gross					$ 22,000,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)					5,929,267
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable					$ 16,932,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total					3,795,000
Goodwill, Ending Balance					12,339,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities, Total					3,984,000
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual									23,100,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual									$ 9,200,000
Business Combination, Acquisition Related Costs										$ 900,000
Business Combination, Consideration Transferred, Total					$ 38,932,000
GTS Subsidiary [Member] | Coax Fiber Solutions (CFS) [Member]
Payments to Acquire Businesses, Gross	$ 800,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)	125,000
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	$ 146,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Total	400,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total	500,000
Goodwill, Ending Balance	1,500,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities, Total	$ 1,500,000