Significant Accounting Policies (Policies)	3 Months Ended
Significant Accounting Policies (Policies)	Mar. 31, 2019
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	Basis of Presentation The accompanying interim unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America and the rules and regulations of the United States Securities and Exchange Commission for interim financial information, which includes condensed consolidated financial statements. Accordingly, they do not include all the information and notes necessary for a comprehensive presentation of financial position and results of operations and should be read in conjunction with the Company's Annual Report on Form 10 -K for the year ended December 31, 2018. The condensed consolidated balance sheet as of December 31, 2018 has been derived from the audited financial statements as of that date included in the Company's Annual Report on Form 10 -K for the year ended December 31, 2018. It is management's opinion that all material adjustments (consisting of normal recurring adjustments) have been made, which are necessary for a fair financial statement presentation. Significant intercompany accounts and transactions have been eliminated in consolidation. The results for the interim period are not necessarily indicative of the results to be expected for the remaining quarters or year ending December 31, 2019.
Use of Estimates, Policy [Policy Text Block]	Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Significant estimates include estimates used to review the Company’s Goodwill, impairments and estimations of long-lived assets, revenue recognition on cost-to-cost-method type contracts, inventory valuation, trading securities, warranty reserves, refund liabilities/returns allowances, valuations of non-cash capital stock issuances and the valuation allowance on deferred tax assets. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable in the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions.
Company Conditions, Policy [Policy Text Block]	Company Conditions The continued delays in shipment of GasPTs on a significant project due to governmental delays and the related slower than expected acceptance of this new disruptive technology has caused a delay in the Company's expected profitability. The Company had losses of $3.0 million and cash used in operating activities of $2.7 million during the three months ended March 31, 2019. As of March 31, 2019, the Company's accumulated deficit is $124.1 million. Management believes the Company's present cash flows will not enable it to meet its obligations for twelve months from the date these financial statements are available to be issued. However, management has developed a plan to address this issue. The plan included obtaining a new long-term financing in the form of a new line of credit and utilizing the cash received from the Company's recent sale/leaseback of the Company's Tualatin headquarters. As part of this plan the Company has obtained a new line of credit from Bank of America for a $10.0 million credit facility, which closed on April 18, 2019. For more information on the Company's new line of credit, see Note 20 Subsequent Events. Including the Company's cash balance, the Company further has $12.4 million of positive working capital primarily related to trade accounts receivable and the Company's inventory less current liabilities that the Company will manage in the next twelve months. Considering the above factors and the new line of credit, management believes it is probable that management’s plans will be achieved and will enable the Company to meet its obligations for the twelve -month period from the date the financial statements are available to be issued.