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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.

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