Note 19 - Segment Information - Percentage of Net Sales to Major Customer (Details) - Revenue Benchmark [Member] - Customer Concentration Risk [Member]	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Customer A [Member]
Revenue percentage by customer	13.00%	15.00%	8.00%
Customer B [Member]
Revenue percentage by customer	11.00%	9.00%	10.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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