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Note 5 - Concentrations (Details Textual)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
USD ($)
Jun. 30, 2021
Jun. 30, 2022
USD ($)
Jun. 30, 2021
Dec. 31, 2021
USD ($)
Accounts Payable and Accrued Liabilities, Current, Total $ 4,042,000   $ 4,042,000   $ 4,068,000
Customer A [Member]          
Accounts Receivable, after Allowance for Credit Loss, Total 169,000   169,000   454,000
Three Vendors [Member]          
Accounts Payable and Accrued Liabilities, Current, Total $ 1,804,000   $ 1,804,000   $ 1,565,000
Supplier Concentration Risk [Member] | Inventory Purchases [Member]          
Number of Major Vendors 3 3 3 3  
Supplier Concentration Risk [Member] | Inventory Purchases [Member] | Three Vendors [Member]          
Concentration Risk, Percentage 92.00% 87.00% 88.00% 82.00%  
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]          
Concentration Risk, Percentage     9.00%   27.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer A [Member]          
Concentration Risk, Percentage     9.00%   27.00%