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