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Note 5 - Long-term Debt (Details Textual) |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Oct. 01, 2019 | Mar. 31, 2019 | Jun. 18, 2018 | Aug. 16, 2016 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) | Dec. 09, 2016 USD ($)
Debt Instrument, Covenant, Interest Coverage Ratio |  |  |  |  | 4 |  |  |
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval |  |  |  |  | $ 50,000 |  |  |
Dividends, Preferred Stock, Cash |  |  |  |  | 23,000 |  |  |
Repayments of Notes Payable |  |  |  | $ 22,600,000 | 166,000 | $ 236,000 | $ 9,501,000 |
Other Loans Payable, Long-term, Noncurrent |  |  |  |  |  |  |  | $ 100,000,000
Debt Instrument, Unamortized Discount, Total |  |  |  |  |  |  |  | $ 200,000
Long-term Debt, Total |  |  |  |  | 417,834,000 | 332,633,000 |  |
Pledged Assets Not Separately Reported, Fixed Assets |  |  |  |  | 900,300,000 |  |  |
Tax-exempt Bond [Member] |  |  |  |  |  |  |  |
Long-term Debt, Total |  |  |  |  | $ 9,983,000 |  |  |
Scenario, Forecast [Member] |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Interest Coverage Ratio | 4 | 2 |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Interest Coverage Ratio |  |  | 1.1 |  |  |  |  |

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- Definition The interest coverage ratio (ICR) is a measure of a company's ability to meet its interest payments. Interest coverage ratio is equal to earnings before interest and taxes (EBIT) for a time period, often one year, divided by interest expenses for the same time period. + References No definition available. + Details
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- Definition The carrying amount, as of the date of the latest financial statement presented, of fixed assets owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. + References No definition available. + Details
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- Definition Amount, after accumulated amortization, of debt discount. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of long-term loans classified as other, payable after one year or the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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