Note 5 - Concentrations - Concentration Risk (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Supplier Concentration Risk [Member] | Vendor A [Member] | Inventory Purchases [Member]
Concentration risk	59.00%	69.00%	52.00%	63.00%
Supplier Concentration Risk [Member] | Vendor B [Member] | Inventory Purchases [Member]
Concentration risk	28.00%	5.00%	30.00%	5.00%
Supplier Concentration Risk [Member] | Vendor C [Member] | Inventory Purchases [Member]
Concentration risk	5.00%	13.00%	6.00%	14.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer A [Member]
Concentration risk			9.00%		27.00%