Note 1 - Nature of Operations and Summary of Significant Accounting Policies: Warranty Reserve: Schedule of Product Warranty Reserve (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Text Block [Abstract]
Beginning balance	$ 171	$ 139
Additions to warranty reserve	139	166
Warranty costs	(139)	(134)
Ending balance	$ 171	$ 171