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Note 3 - Summary of Significant Accounting Policies (Details Textual)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
USD ($)
shares
Sep. 30, 2021
shares
Sep. 30, 2022
USD ($)
shares
Sep. 30, 2021
shares
Dec. 31, 2021
USD ($)
Jun. 30, 2022
USD ($)
Number of Operating Segments     2      
Short-Term Investments, Total $ 9,700,000   $ 9,700,000   $ 13,900,000  
Accounts Receivable, Allowance for Credit Loss, Ending Balance 110,000   110,000     $ 10,000
Unrecognized Tax Benefits, Ending Balance $ 0   0   0  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total     $ 0   $ 0  
Open Tax Year     2018 2019 2020 2021      
Weighted Average Number of Shares Outstanding, Basic, Total (in shares) | shares 70,975,420 69,573,795 70,480,706 68,609,143    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares     8,135,704 7,674,239