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Note 1 - Nature of Operations and Basis of Presentation (Details Textual) | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Number of Operating Segments | 3 |
Accounts Receivable, Allowance for Credit Loss, Ending Balance | $ 242,000 | $ 952,000
Contract with Customer, Refund Liability, Total | 1,348,000 | 1,050,000
Advertising Expense | 8,406,000 | 8,106,000
Operating Expenses, Total | 77,565,000 | 75,600,000
Shipping and Handling [Member] |  |
Operating Expenses, Total | $ 10,523,000 | $ 10,641,000
Customer Concentration Risk [Member] | Accounts Receivable [Member] |  |
Number of Major Customers | 0 | 0

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