Note 16 - Income Taxes - Summary of Net operating Loss and Tax Credit Carryforwards (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Not Subject to Expiration [Member]
Net operating losses	$ 16,151
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Expiration Years 2024 - 2037 [Member]
Net operating losses	94,886
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Expiration Years 2026 - 2035 [Member]
Tax credits	1,316
State and Local Jurisdiction [Member] | Not Subject to Expiration [Member]
Tax credits	325
State and Local Jurisdiction [Member] | Expiration Years 2028 - 2037 [Member]
Net operating losses	$ 90,455