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Note 5 - Concentrations (Details Textual)
3 Months Ended 12 Months Ended
Mar. 31, 2023
USD ($)
Mar. 31, 2022
Dec. 31, 2022
USD ($)
Accounts Payable and Accrued Liabilities, Current $ 2,210,000   $ 2,333,000
Customer A [Member]      
Accounts Receivable, after Allowance for Credit Loss 158,000   184,000
Customer C [Member]      
Accounts Receivable, after Allowance for Credit Loss 110,000    
Customer B [Member]      
Accounts Receivable, after Allowance for Credit Loss     136,000
Two Vendors [Member]      
Accounts Payable and Accrued Liabilities, Current $ 417,000    
Three Vendors [Member]      
Accounts Payable and Accrued Liabilities, Current     $ 200,000
Supplier Concentration Risk [Member] | Inventory Purchases [Member]      
Number of Major Vendors 2 3  
Supplier Concentration Risk [Member] | Inventory Purchases [Member] | Two Vendors [Member]      
Concentration Risk, Percentage 78.00%    
Supplier Concentration Risk [Member] | Inventory Purchases [Member] | Three Vendors [Member]      
Concentration Risk, Percentage   76.00%  
Customer Concentration Risk [Member] | Accounts Receivable [Member]      
Number of Major Customers 1    
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer A [Member]      
Concentration Risk, Percentage 20.00% 15.00% 15.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer C [Member]      
Concentration Risk, Percentage 14.00% 0.00%  
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer B [Member]      
Concentration Risk, Percentage 0.00% 11.00% 11.00%