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Number of options outstanding, including both vested and non-vested options.

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Stock-Based Compensation - Stock incentive plan and other information (Details) - USD ($)		3 Months Ended		6 Months Ended
	Nov. 02, 2010	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Sep. 17, 2020	Sep. 05, 2019
Stock-Based Compensation
Unrecognized stock-based compensation expense		$ 693,000		$ 693,000
Location, Statement of Income, Balance [Axis]: us-gaap:GeneralAndAdministrativeExpense \| Employees
Stock-Based Compensation
Allocated share-based compensation expense		113,000	$ 139,000	217,000	$ 223,000
Consultant \| Location, Statement of Income, Balance [Axis]: us-gaap:GeneralAndAdministrativeExpense
Stock-Based Compensation
Allocated share-based compensation expense		$ 22,000	$ 34,000	$ 53,000	$ 50,000
2010 Stock Plan
Stock-Based Compensation
Share-based compensation arrangement by share-based payment award, number of shares authorized	343						16,000
Share-based payment award, options, outstanding, number		5,893		5,893
Share-based payment award, options, issued, number		5,893		5,893
Share-based compensation arrangement by share-based payment award, shares issued				0
2010 Stock Plan \| Minimum
Stock-Based Compensation
Share-based payment award, options, grants, expired period	5 years
2010 Stock Plan \| Maximum
Stock-Based Compensation
Share-based payment award, options, grants, expired period	10 years
2020 Stock Plan
Stock-Based Compensation
Share-based compensation arrangement by share-based payment award, number of shares authorized		4,500,000		4,500,000		16,000
Share-based payment award, options, outstanding, number		2,570,159		2,570,159
Share-based payment award, options, issued, number		2,570,159		2,570,159