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Note 5 - Concentrations (Details Textual)
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Accounts Payable and Accrued Liabilities, Current, Total $ 4,068,000 $ 2,525,000
Customer C [Member]    
Accounts Receivable, after Allowance for Credit Loss, Total 454,000  
Customer A [Member]    
Accounts Receivable, after Allowance for Credit Loss, Total   210,000
Customer B [Member]    
Accounts Receivable, after Allowance for Credit Loss, Total   127,000
Four Vendors [Member]    
Accounts Payable and Accrued Liabilities, Current, Total $ 1,494,000 $ 270,000
Supplier Concentration Risk [Member] | Inventory Purchases [Member]    
Number of Major Vendors 2 4
Supplier Concentration Risk [Member] | Inventory Purchases [Member] | Two Vendors [Member]    
Concentration Risk, Percentage 73.00% 90.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member]    
Number of Major Customers 1 2
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]    
Concentration Risk, Percentage 27.00%  
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Two Customers [Member]    
Concentration Risk, Percentage   27.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer C [Member]    
Concentration Risk, Percentage 27.00% 0.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer A [Member]    
Concentration Risk, Percentage 0.00% 17.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer B [Member]    
Concentration Risk, Percentage 0.00% 10.00%