Quarterly report pursuant to Section 13 or 15(d)

Note 14 - Income Taxes (Details Textual)

v3.19.1
Note 14 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
Jan. 01, 2018
Dec. 22, 2017
Mar. 31, 2019
Dec. 31, 2018
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 35.00%    
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax, Percentage Reclassified to Income Tax Receivable     50.00% 50.00%
Unrecognized Tax Benefits, Ending Balance     $ 0 $ 0
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]        
Operating Loss Carryforwards, Total     130,900  
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Research Tax Credit Carryforward [Member]        
Tax Credit Carryforward, Amount     8,700  
State and Local Jurisdiction [Member]        
Operating Loss Carryforwards, Total     20,300  
Other Noncurrent Assets [Member]        
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax     $ 1,200 $ 1,200