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Note 16 - Stock-based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands									3 Months Ended		9 Months Ended
	Sep. 07, 2023	Nov. 18, 2022	Nov. 01, 2022	Oct. 31, 2022	Oct. 01, 2021	Dec. 18, 2020	Sep. 07, 2018	Sep. 05, 2018	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)											0
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)											56,107
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)									1,046,947		1,046,947		1,146,947
Share-Based Payment Arrangement, Expense									$ 200	$ 200	$ 700	$ 700
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance (in dollars per share)									$ 5.24		$ 5.24		$ 5.19
SPI RUA [Member] | Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	199,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount									$ 100		$ 100
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)	83,333
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)									115,667		115,667
Share-Based Payment Arrangement, Expense									$ 100		$ 100
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)	5 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	59.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	4.29%
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance (in dollars per share)									$ 1.11		$ 1.11
A2018 Restricted Stock Awards [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)								500,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount									$ 200		$ 200
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)									500,000		500,000
A2020 Modified PWSC Restricted Stock Awards [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number (in shares)									0		0		0
A2020 Modified PWSC Restricted Stock Awards [Member] | Restricted Stock [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount									$ 2,500		$ 2,500
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)											100,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)									546,947		546,947
A2018 PWSC Restricted Stock Awards [Member] | Restricted Stock [Member] | Officer of PWSC [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)							1,000
PWSC Restricted Stock Award 2020 [Member] | Restricted Stock [Member] | Officer of PWSC [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)						250
PWSC Restricted Stock Award [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)										0		0	0
Share-Based Payment Arrangement, Expense										$ 2,700		$ 2,800
Ravix RUA 2021 [Member] | Restricted Common Unit Awards [Member] | Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)					199,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount									$ 200		$ 200
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)					83,333						15,625
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)									75,736		75,736		91,361
Share-Based Payment Arrangement, Expense									$ 100	100	$ 100	100
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)			2 years 11 months 1 day	2 years 11 months 1 day	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate			72.00%	58.00%	75.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate			4.44%	4.44%	0.93%
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance (in dollars per share)									$ 3.08		$ 3.08
Ravix RUA 2021 [Member] | Restricted Common Unit Awards [Member] | Officer [Member] | Maximum [Member]
Share-Based Payment Arrangement, Expense			$ 100
SNS RUA [Member] | Restricted Common Unit Awards [Member] | Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		75,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount									$ 200		$ 200
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)		25,000									0
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)									50,000		50,000		50,000
Share-Based Payment Arrangement, Expense									$ 100	$ 0	$ 100	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)		4 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate		85.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate		4.09%
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance (in dollars per share)									$ 5.95		$ 5.95

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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