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Note 1 - Significant Accounting Policies - Summary of Allowance for Doubtful Accounts (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Balance at beginning of year $ 7,000 $ 7,000
Additions charged to expense 0 0
Recovery of amounts previously reserved 0 0
Amounts written off 0 0
Balance at end of year $ 7,000 $ 7,000