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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (1,166,000) $ (826,000)
Adjustments to reconcile net loss to net cash    
Amortization of patents 88,000 67,000
Stock-based compensation 121,000 161,000
Gain on equity investment (1,052,000)
Share of net loss from equity method investment 741,000
Deferred tax expense (benefit) 245,000 (149,000)
Amortization of right of use asset 27,000
Unrealized loss (gain) on marketable net securities 340,000 (170,000)
Changes in operating assets and liabilities:    
Other current assets 88,000 52,000
Accounts payable 403,000 1,000
Operating lease obligations (24,000)
Accrued expenses (309,000) (382,000)
  NET CASH USED IN  OPERATING ACTIVITIES (1,242,000) (502,000)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Sales of marketable securities 5,110,000 7,554,000
Purchases of marketable securities (6,300,000) (4,990,000)
Acquisition of patents (250,000) (414,000)
NET CASH (USED IN) PROVIDED BY INVESTING ACTIVITIES (1,440,000) 2,150,000
  CASH FLOWS FROM FINANCING ACTIVITIES:    
Cash dividends paid (1,140,000) (1,155,000)
Value of shares delivered to fund payment of withholding taxes (9,000) (7,000)
Repurchases of common stock, inclusive of commissions (136,000) (207,000)
NET CASH USED IN FINANCING ACTIVITIES: (1,285,000) (1,369,000)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (3,967,000) 279,000
CASH AND CASH EQUIVALENTS, beginning of period 13,402,000 13,145,000
CASH AND CASH EQUIVALENTS, end of period 9,435,000 13,424,000
Cash paid during the period for:    
Interest
Income taxes
NON-CASH FINANCING ACTIVITIES    
Accrued dividend rights on restricted stock units, net of forfeitures (142,000) 27,000
Shares issued for acquisition of patents $ (125,000)