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Note 1 - Summary of Significant Accounting Policies (Details Textual) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 USD ($) T | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2020 USD ($) T | Mar. 31, 2019 USD ($) | Apr. 01, 2019 USD ($)
Accounts Receivable, Allowance for Credit Loss, Ending Balance | $ 67,417 |  |  |  | $ 14,178 |  |  |  | $ 67,417 | $ 14,178 |
Inventory Write-down |  |  |  | $ 955,605 |  |  |  |  | 955,605 |  |
Impairment of Long-Lived Assets Held-for-use |  |  |  |  |  |  |  |  | 4,338,419 | 1,723,539 |
Interest Paid, Including Capitalized Interest, Operating and Investing Activities, Total |  |  |  |  |  |  |  |  | 5,000 | 17,500 |
Income Taxes Paid, Net, Total |  |  |  |  |  |  |  |  | 261,000 | 1,846,000 |
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 |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 32,980,607 | $ 28,150,817 | $ 39,995,580 | $ 40,975,320 | 42,203,066 | $ 43,326,080 | $ 53,432,029 | $ 48,193,318 | $ 142,102,324 | $ 187,154,493 |
Operating Lease, Right-of-Use Asset |  |  |  |  |  |  |  |  |  |  | $ 63,000
Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  |  |  |  |  |  |  |  | $ 63,000
Trinity Industries, Inc. [Member] | Customer Concentration Risk [Member] | Revenue, Product and Service Benchmark [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 18.00% | 21.00% |
Mill Reject Pipe [Member] |  |  |  |  |  |  |  |  |  |  |
Inventory, Material Weight (US Ton) | T | 26,500 |  |  |  |  |  |  |  | 26,500 |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | $ 1,471,000 | $ 1,617,000 |
Transfer of Ownership of Life Insurance Policy to Retired Officer [Member] |  |  |  |  |  |  |  |  |  |  |
Other Significant Noncash Transaction, Value of Consideration Given |  |  |  |  |  |  |  |  | 121,000 |  |
Life Insurance Policies Transfer [Member] |  |  |  |  |  |  |  |  |  |  |
Liability, Other Retirement Benefits | $ 99,864 |  |  |  | $ 210,257 |  |  |  | $ 99,864 | $ 210,257 |

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