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Note 1 - Summary of Significant Accounting Policies (Details Textual) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) T | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2021 USD ($) T | Mar. 31, 2020 USD ($)
Accounts Receivable, Allowance for Credit Loss, Ending Balance | $ 17,834 |  |  |  | $ 67,417 |  |  |  | $ 17,834 | $ 67,417
Inventory Write-down |  |  |  | $ 274,093 |  |  |  | $ 955,605 | 274,093 | 955,605
Impairment of Long-Lived Assets Held-for-use |  |  |  |  |  |  |  |  |  | 4,338,419
Interest Paid, Including Capitalized Interest, Operating and Investing Activities, Total |  |  |  |  |  |  |  |  | 8,000 | 5,000
Income Taxes Paid, Net, Total |  |  |  |  |  |  |  |  | 10,000 | 261,000
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability |  |  |  |  |  |  |  |  |  | 518,616
Scrapping of Old Assets No Longer Used in Operations |  |  |  |  |  |  |  |  |  | 4,721,500
Unrecognized Tax Benefits, Ending Balance | $ 0 |  |  |  | 0 |  |  |  | $ 0 | 0
Inventory, Material Weight (US Ton) | T | 22,500 |  |  |  |  |  |  |  | 22,500 |
Revenue from Contract with Customer, Including Assessed Tax | $ 49,214,204 | $ 28,502,049 | $ 24,861,680 | $ 23,524,600 | 32,980,607 | $ 28,150,817 | $ 39,995,580 | $ 40,975,320 | $ 126,102,533 | $ 142,102,324
Trinity Industries, Inc. [Member] | Customer Concentration Risk [Member] | Revenue, Product and Service Benchmark [Member] |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  |  | 18.00%
Mill Reject Pipe [Member] |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | 1,775,000 | $ 1,471,000
Transfer of Ownership of Life Insurance Policy to Retired Officer [Member] |  |  |  |  |  |  |  |  |  |
Other Significant Noncash Transaction, Value of Consideration Given |  |  |  |  |  |  |  |  |  | 121,000
Decatur Facility Equipment Project [Member] |  |  |  |  |  |  |  |  |  |
Capital Expenditures Incurred but Not yet Paid |  |  |  |  |  |  |  |  | 394,955 |
Life Insurance Policies Transfer [Member] |  |  |  |  |  |  |  |  |  |
Liability, Other Retirement Benefits | $ 108,609 |  |  |  | $ 99,864 |  |  |  | $ 108,609 | $ 99,864

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