Note 8 - Stockholders' Equity (Details Textual) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended	108 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2015	Dec. 31, 2024	Oct. 27, 2014
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	$ (433,000)	$ 1,000	$ (1,041,000)	$ (70,000)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	(128,000)	(69,000)	(181,000)	(258,000)
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent	$ 0	$ 0	$ 0	$ 0
Share Repurchase Program, Authorized, Amount							$ 5,000,000
Treasury Stock, Shares, Acquired (in shares)	0	0	0		908,000	0
Shares Acquired, Average Cost Per Share (in dollars per share)					$ 2.52
Treasury Stock, Value, Acquired, Cost Method					$ 2,300,000
Share Repurchase Program, Remaining Authorized, Amount	$ 2,700,000		$ 2,700,000
Dividends Payable, Current	$ 2,901,000		$ 2,901,000			$ 2,901,000
Series A Preferred Stock [Member]
Dividends Payable, Current					$ 2,900,000