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Note 6 - Long-term Debt - Summary of Long-term Debt (Details) (Parentheticals) | Mar. 31, 2020 | Mar. 31, 2019
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Line of Credit [Member] |  |
Long-term debt, weighted average interest rate | 2.59% | 4.00%
Long-term debt, maturity date | Dec. 31, 2022 | Dec. 31, 2022
Term Loan [Member] |  |
Long-term debt, weighted average interest rate | 4.54% | 4.77%
Long-term debt, maturity date | Dec. 31, 2022 | Dec. 31, 2022
Tax-exempt Bond [Member] |  |
Long-term debt, weighted average interest rate | 3.01% | 3.19%
Long-term debt, maturity date | Dec. 31, 2033 | Dec. 31, 2033
Secured Promissory Note 1 [Member] |  |
Long-term debt, weighted average interest rate | 6.35% | 6.35%
Long-term debt, maturity date | Dec. 31, 2020 | Dec. 31, 2020
Economic Development Note [Member] |  |
Long-term debt, weighted average interest rate | 2.00% | 2.00%
Long-term debt, maturity date | Dec. 31, 2021 | Dec. 31, 2021

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- Definition Maturity date of long-term debt, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Weighted average interest rate of long-term debt outstanding calculated at point in time. + References No definition available. + Details
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