Note 4 - Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Compensation costs	$ 560,000	$ 448,000
Customer deposits	77,000	118,000
Professional fees	86,000	104,000
Taxes and regulatory fees	201,000	22,000
Accrued rent	170,000	202,000
Accrued dividends on Series F Preferred Stock	29,000	136,000
Other accrued expenses and liabilities	8,000	8,000
Accrued Liabilities and Other Liabilities, Current	$ 1,131,000	$ 1,038,000