Note 5 - Concentrations -Company's Purchase of inventory (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Inventory Purchases [Member] | Supplier Concentration Risk [Member] | Vendor A [Member]
Concentration	0.00%		66.00%
Inventory Purchases [Member] | Supplier Concentration Risk [Member] | Vendor B [Member]
Concentration	0.00%		12.00%
Inventory Purchases [Member] | Supplier Concentration Risk [Member] | Vendor C [Member]
Concentration	23.00%		0.00%
Inventory Purchases [Member] | Supplier Concentration Risk [Member] | Vendor D [Member]
Concentration	21.00%		0.00%
Inventory Purchases [Member] | Supplier Concentration Risk [Member] | Vendor E [Member]
Concentration	16.00%		0.00%
Inventory Purchases [Member] | Supplier Concentration Risk [Member] | Vendor F [Member]
Concentration	12.00%		0.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer A [Member]
Concentration	35.00%	27.00%
Customer	$ 129,000	$ 93,000
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer B [Member]
Concentration	22.00%	13.00%
Customer	$ 81,000	$ 47,000
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer C [Member]
Concentration	15.00%	0.00%
Customer	$ 54,000
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer D [Member]
Concentration	0.00%	20.00%
Customer		$ 71,000
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer E [Member]
Concentration	0.00%	11.00%
Customer				$ 39,000
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer F [Member]
Concentration	0.00%	10.00%
Customer				$ 33,000