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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Interest Costs Capitalized   $ 12,000
Goodwill, Impairment Loss   1,400,000
Goodwill, Ending Balance $ 0 0
Research and Development Expense, Total 317,000 287,000
Advertising Expense $ 11,000 $ 80,000