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Note 7 - Income Taxes (Details Textual) - USD ($) | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Effective Income Tax Rate Reconciliation, Percent, Total |  | 31.90% | 38.00% | 32.60%
Effective Income Tax Rate Continuing Operations Change |  | 6.10% |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Percentage |  | (9.90%) |  |
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Percent |  | (4.90%) |  |
Effective Income Tax Rate Reconciliation, Change in Federal and State Credits and Incentives, Percent |  | 8.80% |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 31.50% | 35.00% | 35.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  | $ (1,400,000) |  |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent, Total |  | 10,289,000 | $ 1,370,000 |
Tax Credit Carryforward, Valuation Allowance |  | 3,900,000 |  |
Unrecognized Tax Benefits, Period Increase (Decrease), Total |  | 0 | 100,000 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total |  | 100,000 | $ 100,000 |
Tax Cuts and Jobs Act, Increase (Decrease) in Net Deferred Tax liability |  | (3,300,000) |  |
California Franchise Tax Board [Member] |  |  |  |
Tax Credit Carryforward, Amount |  | 1,500,000 |  |
New York State Division of Taxation and Finance [Member] |  |  |  |
Tax Credit Carryforward, Amount |  | 1,300,000 |  |
Wisconsin Department of Revenue [Member] |  |  |  |
Tax Credit Carryforward, Amount |  | $ 2,200,000 |  |
Scenario, Forecast [Member] |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% |  |  |

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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to change in federal and state credits and incentives. + References No definition available. + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to Tax Cuts and Jobs Act. + References No definition available. + Details
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