Significant Accounting Policies (Policies)	9 Months Ended
Significant Accounting Policies (Policies)	Sep. 30, 2018
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	Basis of Presentation We have prepared the accompanying unaudited financial statements pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). Pursuant to these rules and regulations, we have condensed or omitted certain information and footnote disclosures we normally include in our annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”). In management’s opinion, we have made all adjustments (consisting only of normal, recurring adjustments) necessary to fairly present our financial position, results of operations and cash flows. Our interim period operating results do not necessarily indicate the results that may be expected for any other interim period or for the full year. These financial statements and accompanying notes should be read in conjunction with the financial statements and notes thereto in our Annual Report on Form 10 -K for the year ended December 31, 2017 on file with the SEC. There have been no material changes to our significant accounting policies as compared to the significant accounting policies described in the financial statements in our Annual Report on Form 10 -K for the year ended December 31, 2017, except the adoption of Accounting Standards Update (ASU) No. 2014 - 09, Revenue from Contracts with Customers (Topic 606 ).
Revenue from Contract with Customer [Policy Text Block]	Revenue Recognition On January 1, 2018, we adopted Accounting Standards Update (ASU) No. 2014 - 09, Revenue from Contracts with Customers (Topic 606 ) using the modified retrospective approach applied to those contracts in effect as of January 1, 2018. Under this transition method, results for reporting periods beginning after January 1, 2018 are presented under the new standard, while prior period amounts are not adjusted and continue to be reported in accordance with our historical accounting under Topic 605, Revenue Recognition. Adoption of the new standard did not have an impact on the amounts reported in our financial statements and there were no other significant changes impacting the timing or measurement of our revenue or our business processes and controls. To determine revenue recognition for contractual arrangements that we determine are within the scope of Topic 606, we perform the following five steps: (i) identify each contract with a customer; (ii) identify the performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to our performance obligations in the contract; and (v) recognize revenue when (or as) we satisfy the relevant performance obligation. We only apply the five -step model to contracts when it is probable that we will collect the consideration we are entitled to in exchange for the goods or services we transfer to the customer. Our revenues are primarily generated from the sale of our biopreservation media products. We generally recognize product revenue, including shipping and handling charges billed to customers, when we transfer control of our products to our customers as our contracts have a single performance obligation (transfer of control generally occurs upon shipment of our product). We are not required to disclose the value of unsatisfied performance obligations as our contracts have a duration of one year or less. We invoice and receive payment from our customers after we recognize revenue, resulting in receivables from our customers that are presented as accounts receivable on our balance sheet. Accounts receivable consist of short-term amounts due from our customers (generally 30 to 90 days) and are stated at the amount we expect to collect. We establish an allowance for doubtful accounts based on our assessment of the collectability of specific customer accounts. Changes in accounts receivable are primarily due to the timing and magnitude of orders of our products, the timing of when control of our products is transferred to our customers and the timing of cash collections.
Equity Method Investments [Policy Text Block]	Equity Method Investments We account for our ownership in our SAVSU Technologies, Inc. joint venture (“SAVSU”) using the equity method of accounting. This method states that if the investment provides us the ability to exercise significant influence, but not control, over the investee, we account for the investment under the equity method. Significant influence is generally deemed to exist if the Company’s ownership interest in the voting stock of the investee ranges between 20% and 50%, although other factors, such as representation on the investee’s board of directors, are considered in determining whether the equity method of accounting is appropriate. Under the equity method of accounting, the investment is recorded at its initial carrying value in the balance sheet and is periodically adjusted for capital contributions, dividends received and our share of the investee’s earnings or losses together with other-than-temporary impairments which are recorded as a component of other income (expense), net in the statements of operations. On January 22, 2018, as a result of SAVSU signing a global distribution agreement with World Courier, we amended our agreement with SAVSU to fix our equity position at 35%, prior to any dilution created by financing activities post December 31, 2016, and terminated the sales and marketing services agreement. Our ownership in SAVSU was 35% at December 31, 2017. As a result of an additional $6 million in cash contributions made by us and additional contributions made by the majority stockholder, our effective ownership was 44.4% at September 30, 2018. Additionally, we have an 18 -month purchase option which provides us, at our sole discretion, with the right to acquire the 56% ownership interest of SAVSU not already owned, in exchange for the greater of 1,000,000 shares of our common stock, or approximately $23 million of our common stock, calculated on the day of exercise. For the three and nine months ended September 30, 2018, SAVSU’s net loss totaled $16,000 and $1.1 million, respectively. For the three and nine months ended September 30, 2017, SAVSU’s net loss totaled $0.5 million and $1.6 million, respectively.
Concentration Risk, Credit Risk, Policy [Policy Text Block]	Concentrations of credit risk and business risk In the three and nine months ended September 30, 2018, we derived approximately 41% of our product revenue from three customers and approximately 28% of our revenue from two customers, respectively. In the three and nine months ended September 30, 2017, we derived approximately 22% of our product revenue from two customers and 10% of our product revenue from one customer, respectively. No other customer accounted for more than 10% of revenue in the three and nine months ended September 30, 2018 or 2017. At September 30, 2018, four customers accounted for approximately 54% of total gross accounts receivable. At December 31, 2017, two customers accounted for approximately 41% of total gross accounts receivable. Revenue from customers located in foreign countries represented 8% and 10% of total revenue during the three and nine months ended September 30, 2018, respectively, and 16% and 17% during the three and nine months ended September 30, 2017, respectively. All revenue from foreign customers is denominated in United States dollars.
New Accounting Pronouncements, Policy [Policy Text Block]	Recent Accounting Pronouncements In August 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2016 - 15, Statement of Cash Flows (Topic 230 ): Classification of Certain Cash Receipts and Cash Payments (ASU 2016 - 15 ). The updated guidance clarifies how companies present and classify certain cash receipts and cash payments in the statement of cash flows. We adopted the new standard on January 1, 2018, with no material impact on our financial statements. In February 2016, the FASB issued Accounting Standards Update No. 2016 - 02, Leases: Topic 842 (ASU 2016 - 02 ) that replaces existing lease guidance. The new standard is intended to provide enhanced transparency and comparability by requiring lessees to record right-of-use assets and corresponding lease liabilities on the balance sheet. Under the new guidance, leases will continue to be classified as either finance or operating, with classification affecting the pattern of expense recognition in the Statements of Operations. Lessor accounting is largely unchanged under ASU 2016 - 02. The new guidance will be effective for fiscal years and interim periods within those years beginning after December 15, 2018. Early adoption will be permitted for all entities. The Company will adopt ASU 2016 - 02 on January 1, 2019. The FASB has issued several additional ASUs that provide additional clarification to certain issues existing after the original ASU was released. In July 2018, the FASB issued ASU 2018 - 11 Leases (Topic 842 ) Targeted Improvements which provides entities with an additional and optional transition method to adopt the new lease standard and provide lessors with a practical expedient, by class of underlying asset, to not separate non-lease components from the associated lease component and, instead, to account for those components as a single component if certain criteria are met. Also, in July 2018, the FASB issued ASU 2018 - 10 Codification Improvements to Topic 842 to make amendments addressing sixteen issues related to various aspects of ASU 2016 - 02. The effective date and transition requirements for the amendments in ASU 2018 - 11 and ASU 2018 - 10 will be the same as the effective date and transition requirements in ASU 2016 - 02. The Company is evaluating the effect of ASU 2018 - 11 and ASU 2018 - 10 on its financial statements. While the Company is continuing to evaluate the effects of this ASU, the Company expects to record material right of use assets and lease liabilities on its balance sheet upon adoption. The new standard will also require expanded qualitative and quantitative disclosures regarding the Company’s leases. In January 2016, the FASB issued Accounting Standards Update No. 2016 - 01, Recognition and Measurement of Financial Assets and Financial Liabilities: Topic 825 (ASU 2016 - 01 ). The updated guidance enhances the reporting model for financial instruments, which includes amendments to address aspects of recognition, measurement, presentation and disclosure. We adopted the new standard on January 1, 2018, with no material impact on our financial statements. With the exception of the new standards discussed above, there have been no new accounting pronouncements not yet effective that have significance, or potential significance, to our Financial Statements.