Note 1 - Organization and Significant Accounting Policies - Concentrations Risk by Geographic Locations (Details) - Revenue Benchmark [Member] - Geographic Concentration Risk [Member]	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue by customers’ geographic locations, percentage	100.00%	100.00%
UNITED STATES
Revenue by customers’ geographic locations, percentage	75.00%	74.00%
CANADA
Revenue by customers’ geographic locations, percentage	10.00%	11.00%
EMEA [Member]
Revenue by customers’ geographic locations, percentage	12.00%	12.00%
Geographic, Other [Member]
Revenue by customers’ geographic locations, percentage	3.00%	3.00%