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Note 8 - Stockholders' Equity (Details Textual) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended 108 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2015
Dec. 31, 2024
Oct. 27, 2014
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest $ 10,000 $ (140,000) $ (1,031,000) $ (210,000)      
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest 65,000 376,000 246,000 118,000      
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