Note 2 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Retailer [Member]
Percentage of revenue	38.00%	43.00%
Distribution [Member]
Percentage of revenue	62.00%	57.00%
Non-US [Member]
Percentage of revenue	17.00%	19.00%
UNITED STATES
Percentage of revenue	83.00%	81.00%