Note 5 - Concentrations -Company's Purchase of Inventory 2 (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Customer A [Member]
Customer	$ 93,000	$ 184,000
Customer A [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Concentration risk, percentage	27.00%	15.00%
Customer B [Member]
Customer	$ 0	$ 136,000
Customer B [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Concentration risk, percentage	0.00%	11.00%
Customer C [Member]
Customer	$ 71,000
Customer C [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Concentration risk, percentage	20.00%	0.00%
Customer D [Member]
Customer	$ 47,000
Customer D [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Concentration risk, percentage	13.00%	0.00%
Customer E [Member]
Customer	$ 39,000
Customer E [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Concentration risk, percentage	11.00%	0.00%
Customer F [Member]
Customer	$ 33,000
Customer F [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Concentration risk, percentage	10.00%	0.00%