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Note 3 - Investments (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Aug. 01, 2024
Jul. 01, 2024
Sep. 30, 2024
Mar. 31, 2021
Sep. 30, 2020
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Jun. 30, 2020
Feb. 28, 2017
Proceeds from Sale of Equity Method Investments           $ 0 $ 1,500,000      
Gain (Loss) on Disposition of Stock in Subsidiary or Equity Method Investee           0 1,500,000      
Proceeds from Sale of Business               $ 1,904,000    
Proceeds from Divestiture of Businesses, Held in Escrow               211,000    
Global Public Safety [Member]                    
Equity Method Investment, Ownership Percentage   19.90%               19.90%
Equity Securities without Readily Determinable Fair Value, Amount               $ 0    
Proceeds from Sale of Equity Method Investments $ 750,000 $ 750,000 $ 1,500,000              
Gain (Loss) on Disposition of Stock in Subsidiary or Equity Method Investee             1,500,000      
Roker Inc. [Member]                    
Equity Method Investment, Ownership Percentage       50.00%         50.00%  
Equity Securities without Readily Determinable Fair Value, Amount           $ 0 $ 0      
Payments to Acquire Equity Method Investments       $ 75,000 $ 75,000          
Equity Method Investments       $ 150,000