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Note 5 - Goodwill and Intangible Assets (Details Textual) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Goodwill, Impairment Loss		$ 13,819,000
Goodwill, Ending Balance		65,543,000	72,156,000	66,137,000
Intangible Assets, Net (Excluding Goodwill), Total		42,850,000	37,790,000
Cold Chain Packaging [Member]
Goodwill, Impairment Loss	$ 13,819,000	13,819,000
Goodwill, Ending Balance		1,401,000	14,498,000	13,357,000
Intangible Assets, Net (Excluding Goodwill), Total		4,081,000
Amortization of Intangible Assets, Total		$ 6,929,000	$ 6,450,000	$ 5,787,000

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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