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Note 16 - Stock-based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands								3 Months Ended		6 Months Ended
	Nov. 18, 2022	Nov. 01, 2022	Oct. 31, 2022	Oct. 01, 2021	Dec. 18, 2020	Sep. 07, 2018	Sep. 05, 2018	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 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)										(0)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)								1,146,947		1,146,947		1,146,947
Share-Based Payment Arrangement, Expense								$ 200	$ 200	$ 500	$ 500
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)								$ 5.19		$ 5.19		$ 5.19
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								$ 300		$ 300
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (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, Ending Balance (in shares)								0		0
A2020 Modified PWSC Restricted Stock Awards [Member] | Restricted Stock [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount								$ 2,600		$ 2,600
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)										0
Restricted Stock Awards 2021 [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)								646,947		646,947
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]
Share-Based Payment Arrangement, Expense									100		100
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, Ending Balance (in shares)												0
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						10,417
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)								80,944		80,944		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, Ending Balance (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

X

- Definition

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

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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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 number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

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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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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- Definition

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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