Significant Accounting Policies (Policies)	6 Months Ended
Jun. 30, 2022
Accounting Policies [Abstract]
Marketable Securities, Policy [Policy Text Block]	Marketable Securities Marketable securities consist of available-for-sale debt securities and are carried at fair value. Unrealized holding gains and losses are reported within other comprehensive loss in the Company's Consolidated Statements of Comprehensive Loss. Fair value is based on available market information including quoted market prices, broker or dealer quotations, or other observable inputs.
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Adopted Accounting Pronouncements The Company adopted ASU 2019-12, Simplifying the Accounting for Income Taxes, on January 1, 2022. The Company accounts for income taxes pursuant to FASB ASC Topic 740, Income Taxes. Under FASB ASC Topic 740, deferred tax assets and liabilities are determined based on temporary differences between the bases of certain assets and liabilities for income tax and financial reporting purposes. The deferred tax assets and liabilities are classified according to the financial statement classification of the assets and liabilities generating the differences. The Company maintains a valuation allowance with respect to deferred tax assets. The Company establishes a valuation allowance based upon the potential likelihood of realizing the deferred tax asset and taking into consideration the Company’s financial position and results of operations for the current period. Future realization of the deferred tax benefit depends on the existence of sufficient taxable income within the carry-forward period under the federal tax laws. The adoption of ASU 2019-12 did not have any impact on the Company’s condensed consolidated financial statement presentation or disclosures. *Accounting Pronouncements not* yet adopted** In June 2016, the FASB issued ASU No. 2016-13, “Financial Instruments-Credit Losses: Measurement of Credit Losses on Financial Instruments” which has subsequently been amended by ASU No. 2019-04, ASU No. 2019-05, ASU No. 2019-10, ASU No. 2019-11, and ASU No. 2020-03 (“ASU 2016-03”). This guidance replaces the incurred loss impairment methodology under current U.S. GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. This guidance is effective for the Company for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2022 and must be adopted using a modified retrospective approach, with certain exceptions. The Company is currently evaluating the impact of this standard on its financial statements and related disclosures.

Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2022

Marketable Securities, Policy [Policy Text Block]

Marketable Securities

Marketable securities consist of available-for-sale debt securities and are carried at fair value. Unrealized holding gains and losses are reported within other comprehensive loss in the Company's Consolidated Statements of Comprehensive Loss. Fair value is based on available market information including quoted market prices, broker or dealer quotations, or other observable inputs.

New Accounting Pronouncements, Policy [Policy Text Block]

Recently Adopted Accounting Pronouncements

The Company adopted ASU 2019-12, Simplifying the Accounting for Income Taxes, on January 1, 2022. The Company accounts for income taxes pursuant to FASB ASC Topic 740, Income Taxes. Under FASB ASC Topic 740, deferred tax assets and liabilities are determined based on temporary differences between the bases of certain assets and liabilities for income tax and financial reporting purposes. The deferred tax assets and liabilities are classified according to the financial statement classification of the assets and liabilities generating the differences. The Company maintains a valuation allowance with respect to deferred tax assets. The Company establishes a valuation allowance based upon the potential likelihood of realizing the deferred tax asset and taking into consideration the Company’s financial position and results of operations for the current period. Future realization of the deferred tax benefit depends on the existence of sufficient taxable income within the carry-forward period under the federal tax laws. The adoption of ASU 2019-12 did not have any impact on the Company’s condensed consolidated financial statement presentation or disclosures.

Accounting Pronouncements not yet adopted

In June 2016, the FASB issued ASU No. 2016-13, “Financial Instruments-Credit Losses: Measurement of Credit Losses on Financial Instruments” which has subsequently been amended by ASU No. 2019-04, ASU No. 2019-05, ASU No. 2019-10, ASU No. 2019-11, and ASU No. 2020-03 (“ASU 2016-03”). This guidance replaces the incurred loss impairment methodology under current U.S. GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. This guidance is effective for the Company for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2022 and must be adopted using a modified retrospective approach, with certain exceptions. The Company is currently evaluating the impact of this standard on its financial statements and related disclosures.