Note 1 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Summary of Valuation Allowance [Table Text Block]

Description	Balance at Beginning of Period		Charged to Costs and Expenses		Charged to Other Accounts		Deductions (1)			Balance at End of Period
Twelve months ended December 31, 2019	$	57	$	—	$	—	$	(17	)	$	40
Twelve months ended December 31, 2018	$	54	$	8	$	—	$	(5	)	$	57

Estimated Lives of Property, Plant and Equipment [Table Text Block]

Machinery and equipment (in years)	5	-	7
Furniture and fixtures (in years)	5	-	7
Leasehold Improvements (in years)	3	-	5
Computer equipment (in years)	3	-	5

Schedule of Product Warranty Liability [Table Text Block]

	December 31,
	201 9			201 8
Beginning balance	$	365		$	322
Cost of warranty claims		(21	)		(15	)
Accruals for product warranties		(54	)		58
Ending balance	$	290		$	365

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

	December 31, 201 9
	Adjusted Cost		Unrealized Gains		Unrealized Losses		Fair Value		Cash & Cash Equivalents
Level 1:
Cash	$	3,863	$	-	$	-	$	3,863	$	3,863
Restricted Cash		100		-		-		100		100
Total	$	3,963	$	-	$	-	$	3,963	$	3,963

	December 31, 201 8
	Adjusted Cost		Unrealized Gains		Unrealized Losses		Fair Value		Cash & Cash Equivalents
Level 1:
Cash	$	4,781	$	-	$	-	$	4,781	$	4,781
Restricted Cash		100		-		-		100		100
Total	$	4,881	$	-	$	-	$	4,881	$	4,881