Note 13 - Income Taxes (Details Textual) - USD ($) |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount | $ 47,954,000 | $ 38,551,000 | $ 23,824,000 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total | 0 | 0 | 0 |
Undistributed Earnings of Foreign Subsidiaries | $ 750,000 | ||
Open Tax Year | 2018 2019 2020 2021 | ||
Research Tax Credit Carryforward [Member] | |||
Tax Credit Carryforward, Amount | $ 80,925 | ||
Domestic Tax Authority [Member] | |||
Operating Loss Carryforwards, Total | $ 480,331,000 | ||
State and Local Jurisdiction [Member] | |||
Operating Loss Carryforwards, Total | $ 177,567,000 | ||
Foreign Tax Authority [Member] | |||
Operating Loss Carryforwards, Total | $ 29,355,000 |