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Note 5 - Property and Equipment - Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment, Gross	$ 9,450	$ 9,150
Accumulated Depreciation and Amortization	(8,062)	(7,601)
Property, Plant and Equipment, Net	1,388	1,549
Office Furniture and Equipment [Member]
Property, Plant and Equipment, Gross	5,041	4,904
Leasehold Improvements [Member]
Property, Plant and Equipment, Gross	1,570	1,509
Vehicles [Member]
Property, Plant and Equipment, Gross	206	160
Manufacturing and Test Equipment [Member]
Property, Plant and Equipment, Gross	$ 2,633	$ 2,577
Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	2 years
Minimum [Member] | Office Furniture and Equipment [Member]
Property, Plant and Equipment, Useful Life (Year)	3 years
Minimum [Member] | Leasehold Improvements [Member]
Property, Plant and Equipment, Useful Life (Year)	1 year
Minimum [Member] | Vehicles [Member]
Property, Plant and Equipment, Useful Life (Year)	5 years
Minimum [Member] | Manufacturing and Test Equipment [Member]
Property, Plant and Equipment, Useful Life (Year)	2 years
Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	10 years
Maximum [Member] | Office Furniture and Equipment [Member]
Property, Plant and Equipment, Useful Life (Year)	10 years
Maximum [Member] | Leasehold Improvements [Member]
Property, Plant and Equipment, Useful Life (Year)	6 years
Maximum [Member] | Vehicles [Member]
Property, Plant and Equipment, Useful Life (Year)	10 years
Maximum [Member] | Manufacturing and Test Equipment [Member]
Property, Plant and Equipment, Useful Life (Year)	10 years

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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-Name Accounting Standards Codification
-Topic 944
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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

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