Note 2 - Accounts Receivable (Tables)

9 Months Ended

Sep. 30, 2019

Notes Tables

Schedules of Concentration of Risk, by Risk Factor [Table Text Block]

	Three Months Ended September 30,						Nine Months Ended September 30,
Percentage of Revenue	2019			2018			2019			2018
Largest customer		45.6	%		26.5	%		33.6	%		25.7	%
2nd largest customer		15.2	%		20.2	%		20.1	%		23.4	%
3rd largest customer		14.4	%		17.0	%		16.3	%		14.9	%
4th largest customer		10.0	%		13.3	%		12.8	%		11.1	%
Remaining customers		14.8	%		23.0	%		17.2	%		24.9	%
		100.0	%		100.0	%		100.0	%		100.0	%

Percentage of
Accounts Receivable	September 30, 2019			December 31, 2018
Largest customer		54.3	%		31.4	%
2nd largest customer		10.1	%		26.4	%
3rd largest customer		8.8	%		16.1	%
4th largest customer		7.5	%		14.1	%
Remaining customers		19.3	%		12.0	%
		100.0	%		100.0	%