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Note 11 - Related Party Transactions (Details Textual) - USD ($)		1 Months Ended		12 Months Ended
	May 29, 2020	Apr. 30, 2021	Jun. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 10, 2021	Nov. 17, 2021
Debt Instrument, Face Amount				$ 105,000,000
Unsecured Promissory Note With Kurt A Johnson [Member]
Debt Instrument, Face Amount						$ 1,090,000	$ 34,256,000
Debt Instrument, Interest Rate, Stated Percentage						6.00%
Danbury Property Company, Llc [Member]
Operating Leases, Monthly Rent				$ 10,500
Kurt Johnson [Member] \| Minimum [Member] \| Orbital Energy Group Inc [Member]
Ownership, Percent				5.00%
Kurt Johnson [Member] \| Maximum [Member]
Salary and Wage, Excluding Cost of Good and Service Sold, Total				$ 250,000
Manvel Property Management [Member]
Operating Leases, Monthly Rent				$ 4,000
Tidal Power [Member] \| Minimum [Member] \| Orbital Energy Group Inc [Member]
Ownership, Percent				5.00%
Oak Property Group [Member]
Operating Leases, Monthly Rent				$ 2,000
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)				4,386,107
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month)			24 months
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercise Price (in dollars per share)	$ 1.00			$ 2.89
Son of Executive Chairman [Member]
Salary and Wage, Excluding Cost of Good and Service Sold, Total				$ 360,000	$ 335,000
Cash Bonus				309,000	60,000
Other Labor-related Expenses				43,000	49,000
Employee-related Liabilities, Total				$ 0	142,000
Change in Excess of Bonus or Salary					$ 50,000
Son of Executive Chairman [Member] \| Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		235,876			67,187
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grant Date Fair Value, Amount		$ 840,000			$ 40,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month)					2 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercise Price (in dollars per share)					$ 1.00
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)					6 years