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Note 5 - Goodwill and Intangible Assets (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Goodwill, Impairment Loss     $ 1,075 $ 13,819  
Intangible Assets, Net (Excluding Goodwill), Total $ 33,219   33,219 42,850  
Property, Plant and Equipment, Net, Ending Balance 22,225   22,225 23,593  
Revenue from Contract with Customer, Excluding Assessed Tax, Total [1]     103,135 96,179 [2] $ 93,665 [2]
Cold Chain Packaging [Member]          
Goodwill, Impairment Loss     1,075 13,819  
Intangible Assets, Net (Excluding Goodwill), Total 54   54    
Property, Plant and Equipment, Net, Ending Balance 17   17    
Revenue from Contract with Customer, Excluding Assessed Tax, Total [1]     6,907 5,837 8,041
Amortization of Intangible Assets, Total     $ 7,090 $ 6,929 $ 6,450
Impairment of Long-Lived Assets and Goodwill [Member]          
Goodwill, Impairment Loss 47 $ 1,028      
Impairment of Intangible Assets, Finite-lived 737        
Impairment of Long-Lived Assets Held-for-use $ 229 $ 2,641      
[1] Intersegment revenues are not significant and are eliminated to arrive at consolidated totals.
[2] Product and service revenues for the years ended March 31, 2018 and March 31, 2017 were reclassified to align with the current year presentation See Note 2. "Revenue Recognition."