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Note 10 - Income Taxes (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 7,888,000  
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration 3,826,000  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense 0 $ 0
Domestic Tax Jurisdiction [Member]    
Operating Loss Carryforwards 176,630,000 142,415,000
Operating Loss Carryforwards, Net 37,547,000 30,336,000
Domestic Tax Jurisdiction [Member] | Internal Revenue Service (IRS) [Member]    
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration 19,679,000 26,369,000
State and Local Jurisdiction [Member]    
Operating Loss Carryforwards 168,197,000 133,857,000
Operating Loss Carryforwards, Net 9,959,000 8,164,000
Foreign Country, Federal Tax Authority [Member]    
Operating Loss Carryforwards   48,209,000
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration 53,264,000  
Operating Loss Carryforwards, Net 11,185,000 10,124,000
Foreign State and Local Jurisdiction [Member]    
Operating Loss Carryforwards   47,002,000
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration 52,056,000  
Operating Loss Carryforwards, Net 833,000 752,000
Foreign Tax Jurisdiction [Member]    
Operating Loss Carryforwards $ 5,054,000 $ 4,151,000