Note 1 - Organization and Significant Accounting Policies - Concentrations Risk by Geographic Locations (Details) - Revenue Benchmark [Member] - Geographic Concentration Risk [Member]	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue by customers’ geographic locations, percentage	100.00%	100.00%	100.00%	100.00%
UNITED STATES
Revenue by customers’ geographic locations, percentage	73.00%	76.00%	73.00%	70.00%
CANADA
Revenue by customers’ geographic locations, percentage	11.00%	12.00%	13.00%	17.00%
EMEA [Member]
Revenue by customers’ geographic locations, percentage	13.00%	11.00%	12.00%	11.00%
Geographic, Other [Member]
Revenue by customers’ geographic locations, percentage	3.00%	1.00%	2.00%	2.00%