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Significant Accounting Policies (Policies)	3 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	Basis of Presentation The accompanying unaudited Condensed Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) for interim financial information and pursuant to the rules and regulations of the Securities and Exchange Commission. In the opinion of management, such unaudited information includes all adjustments, consisting of normal recurring adjustments necessary for a fair presentation of our financial position and results of operations. The results of operations for the interim periods are not necessarily indicative of results that may be achieved for the entire year. The financial statements and related notes do not include all information and footnotes required by U.S. GAAP for annual reports. This quarterly report should be read in conjunction with the consolidated financial statements included in our annual report on Form 10 -K for the year ended March 31, 2019 .
Fair Value Measurement, Policy [Policy Text Block]	Fair Value Measurements Our financial instruments consist primarily of cash and cash equivalents, trade accounts receivable, obligations under trade accounts payable and short and long-term debt. Due to their short-term nature, the carrying values for cash and cash equivalents, trade accounts receivable and trade accounts payable approximate fair value.  The fair value of our short term and long-term debt reflects the market rates at each period end for debt with financial ratios similar to our ratings and is classified as Level 2 within the fair value hierarchy. Our debt has a variable interest rate, so the carrying amount approximates fair value because interest rates on these instruments approximate the interest rate on debt with similar terms available to us. Assets recognized or disclosed at fair value on the consolidated financial statements on a nonrecurring basis include items such as property and equipment, operating lease assets, goodwill, and other intangible assets. These assets are measured at fair value if determined to be impaired. Except as stated below in "Acquisitions," we had no non-financial assets or liabilities that were measured using Level 3 inputs. There were no transfers between the levels of the fair value hierarchy during the three months ended March 31, 2019 or March 31, 2018, respectively.
Business Combinations Policy [Policy Text Block]	Acquisitions During the three months ended June 30, 2019 , we completed a business combination (the “IBP Acquisition”) whereby we acquired the common stock of IBP Medical GmbH, a company whose business manufactures medical meters used to test various parameters of dialysis fluid (dialysate), and the proper calibration and operation of a dialysis machine.  During the three months ended June 30, 2019, we allocated the purchase price according to the fair value of assets acquired and liabilities assumed using information obtained during due diligence and through the use of financial and other information available to us. Fair value of the assets and liabilities acquired was determined using Level 3 inputs (unobservable inputs) based on a discounted cash flow method.
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Adopted Accounting Pronouncements In February 2016, the FASB issued ASU  2016 - 02,   Leases (Topic 842 ) . The pronouncement requires lessees to recognize a liability for lease obligations, which represents the discounted obligation to make future minimum lease payments, and a corresponding right-of-use asset on the balance sheet for all leases with terms greater than 12 months. The guidance also requires qualitative and quantitative disclosures designed to present financial statement users with the ability to assess the amount, timing, and uncertainty of cash flows arising from leases.  On April 1, 2019, we adopted ASU 2016 - 02  using the modified retrospective method for all lease arrangements at the beginning of the period of adoption. Results for reporting periods beginning April 1, 2019 are presented under ASC 842, while prior period amounts were not adjusted and continue to be reported in accordance with our historic accounting under topic 840,   Leases.   The standard had a material impact on our Condensed Consolidated Balance Sheets, but did not have a significant impact on our Condensed Consolidated Statements of Income or our Condensed Consolidated Statements of Cash Flows. The most significant impact was the recognition of the right-of-use ("ROU") assets and lease liabilities on our Condensed Consolidated Balance Sheets.   As part of adopting the new lease standard, we have made the following elections: ● To carry forward the historical lease determination and classification conclusions as established under the old standard, and not reassess initial direct costs for existing leases; ● Not to apply the balance sheet recognition requirements of the new lease standard to leases with a term of one year or less (short-term leases); and ● For all classes of underlying assets, to account for non-lease components of a contract separately from the lease component to which they are related. As a result of the cumulative impact of adopting ASU 2016 - 02, we recorded operating lease ROU assets of $1,461  and operating lease liabilities of $1,411  as of April 1, 2019. Our calculations were based on the present value of the future lease payments on the date of adoption. Refer to Note 4.   Leases  for additional disclosures required by ASC 842.

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Disclosure of accounting policy for basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS).

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Disclosure of accounting policy for completed business combinations (purchase method, acquisition method or combination of entities under common control). This accounting policy may include a general discussion of the purchase method or acquisition method of accounting (including for example, the treatment accorded contingent consideration, the identification of assets and liabilities, the purchase price allocation process, how the fair values of acquired assets and liabilities are determined) and the entity's specific application thereof. An entity that acquires another entity in a leveraged buyout transaction generally discloses the accounting policy followed by the acquiring entity in determining the basis used to value its interest in the acquired entity, and the rationale for that accounting policy.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 05
-Paragraph 4
-Subparagraph (a)-(d)
-URI http://asc.fasb.org/extlink&oid=6909625&loc=d3e227-128457

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790

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Disclosure of accounting policy for fair value measurements of financial and non-financial assets, liabilities and instruments classified in shareholders' equity. Disclosures include, but are not limited to, how an entity that manages a group of financial assets and liabilities on the basis of its net exposure measures the fair value of those assets and liabilities.

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Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting. Includes, but is not limited to, quantification of the expected or actual impact.

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