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Note 4 - Significant Transactions (Details Textual) - USD ($)
 3 Months Ended 5 Months Ended 12 Months Ended
Oct. 31, 2019
Mar. 31, 2020
Mar. 31, 2020
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Apr. 01, 2019
Payments to Acquire Businesses, Gross       $ 184,102,000 $ 4,840,000   $ 15,518,000  
Amortization of Inventory Step-up Cost       8,502,000        
Amortization of Intangible Assets, Total       10,637,000 7,090,000   6,929,000  
Revenue from Contract with Customer, Excluding Assessed Tax, Total [1]       117,687,000 103,135,000   96,179,000  
Goodwill, Impairment Loss       258,000 1,075,000      
Asset Impairment Charges, Total       298,000 4,774,000   $ 13,819,000  
Cold Chain Packaging [Member]                
Asset Impairment Charges, Total       276,000        
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax       187,000        
Cold Chain Packaging [Member] | Employee Severance and Facility Closure [Member]                
Restructuring Charges, Total       $ 51,000 150,000      
GPT Acquisition [Member]                
Goodwill, Impairment Loss           $ 20,676,000    
Customer Relationships [Member]                
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Year)       9 years 182 days        
Noncompete Agreements [Member]                
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Year)       4 years 146 days        
GPT Acquisition [Member]                
Business Acquisition, Percentage of Voting Interests Acquired 100.00%              
Payments to Acquire Businesses, Gross $ 181,547,000              
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory   $ (1,140,000)            
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Cost of Products Sold   (834,000)            
Inventory Step-up Cost   11,818 $ 11,818 $ 11,818 11,818,000      
Amortization of Inventory Step-up Cost     $ 8,502,000 8,502,000        
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Year) 9 years 328 days              
Amortization of Intangible Assets, Total       9,774,000 $ 9,774,000      
Business Combination, Acquisition Related Costs       1,399,000        
Revenue from Contract with Customer, Excluding Assessed Tax, Total       13,830,000        
Net Income (Loss) Attributable to Parent, Total       $ (7,433,000)        
Effective Income Tax Rate Reconciliation, Percent, Total     25.00%          
GPT Acquisition [Member] | General and Administrative Expense [Member]                
Amortization of Intangible Assets, Total     $ 3,742,000          
GPT Acquisition [Member] | Cost of Sales [Member]                
Amortization of Intangible Assets, Total     $ 314,000          
GPT Acquisition [Member] | Customer Relationships [Member]                
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles   42,873,000            
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Amortization of Intangible Assets   $ 1,706,000            
Finite-Lived Intangible Asset, Useful Life (Year)     10 years          
GPT Acquisition [Member] | Noncompete Agreements [Member]                
Finite-Lived Intangible Asset, Useful Life (Year)     5 years          
GPT Acquisition [Member] | Technology-Based Intangible Assets [Member]                
Finite-Lived Intangible Asset, Useful Life (Year)     10 years          
IBP Acquisition [Member]                
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low               $ 0
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High               490,000
Business Combination, Contingent Consideration, Liability, Total               $ 490,000
[1] Intersegment revenues are not significant and are eliminated to arrive at consolidated totals.