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Note 7 - Shareholders' Equity (Details Textual) - USD ($)
 12 Months Ended
Aug. 13, 2020
Dec. 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)   735,000 [1] 135,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share)   $ 1.67 [1] $ 1.89
Treasury Stock, Common, Shares (in shares)   12,253,502 12,253,502
Treasury Stock, Value, Ending Balance   $ 18,929,915 $ 18,929,915
Common Stock, Par or Stated Value Per Share (in dollars per share) $ 0.001 $ 0.001 $ 0.001
Open Market Sale Agreement [Member]      
Sale of Stock, Authorized Offering Amount $ 50,000,000.0    
Sale of Stock, Percentage of Commissions Paid of Gross Proceeds From Sale Of Each Share 3.00%    
Sale of Stock, Reimbursable Legal Expenses $ 50,000    
Sale of Stock, Termination Amount Under Agreement $ 50,000,000.0    
Common Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)   735,000 135,000
[1] Represents the following stock options exercised: • 500,000 stock options exercised at $1.67, 150,000 stock options exercised at $1.63, 60,000 stock options exercised at $1.93, and 25,000 stock options exercised at $1.39.