Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended			12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Total revenue	$ 10,646	$ 10,420	$ 14,718	$ 31,289	$ 36,073	$ 43,994	$ 59,360
North America [Member]
Total revenue	9,258	8,919		26,067	30,449
Europe [Member]
Total revenue	112	785		476	1,819
Asia [Member]
Total revenue	1,276	716		4,746	3,805
Partner Solutions [Member]
Total revenue	9,638	9,145		28,393	33,160
Partner Solutions [Member] | North America [Member]
Total revenue	8,294	7,819		23,372	28,104
Partner Solutions [Member] | Europe [Member]
Total revenue	68	613		275	1,344
Partner Solutions [Member] | Asia [Member]
Total revenue	1,276	713		4,746	3,712
Edge to Cloud [Member]
Total revenue	1,008	1,275	$ 2,162	2,896	2,913	$ 6,653	$ 8,732
Edge to Cloud [Member] | North America [Member]
Total revenue	964	1,100		2,695	2,345
Edge to Cloud [Member] | Europe [Member]
Total revenue	44	172		201	475
Edge to Cloud [Member] | Asia [Member]
Total revenue	$ 0	$ 3		$ 0	$ 93