Note 4 - Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($)	Dec. 31, 2025	Dec. 31, 2024
Compensation costs	$ 324,000	$ 560,000
Customer deposits	95,000	77,000
Professional fees	79,000	86,000
Taxes and regulatory fees	367,000	201,000
Accrued rent	170,000	170,000
Accrued dividends on Series F Preferred Stock	22,000	29,000
Other accrued expenses and liabilities	4,000	8,000
Accrued Liabilities and Other Liabilities, Current	$ 1,061,000	$ 1,131,000