Note 1 - Organization, Description of Business and Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

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

	Three Months Ended September 30,						Nine Months Ended September 30,
	2020			2019			2020			2019
Medicare		25	%		26	%		24	%		24	%
Johnson and Johnson Services, Inc.		*			13	%		*			12	%
UnitedHealthcare		11	%		11	%		11	%		11	%
		36	%		50	%		35	%		47	%

	September 30, 2020			December 31, 2019
Johnson and Johnson Services, Inc.		*			10	%
Medicare		12	%		15	%
UnitedHealthcare		10	%		*
*Less than 10%