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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands | 3 Months Ended
--- | ---
Jun. 30, 2018 USD ($) | Mar. 31, 2018 shares | Mar. 31, 2017 shares
Number of Reportable Segments |  | 2 |
Weighted Average Number of Shares Outstanding, Basic, Total |  | 4,711,608 | 4,672,316
Weighted Average Number Diluted Shares Outstanding Adjustment, Total |  | 0 | 0
Accounting Standards Update 2018-02 [Member] | Scenario, Forecast [Member] |  |  |
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect | $ | $ 173 |  |

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- Definition The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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