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Note 3 - Summary of Significant Accounting Policies - Effect of Point-of-sale Equipment on Other Current Assets (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Balance $ 525,000 $ 515,000
Purchases 272,000 305,000
Amortization (334,000) (295,000)
Balance $ 463,000 $ 525,000