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Note 6 - Income Taxes (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
  

Year Ended December 31,

 
  

2020

  

2019

  

2018

 
Current:  (Dollars in thousands) 

Federal

 $  $  $ 

State

  65   144   77 

International

         
  $65  $144  $77 
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
  

Year Ended December 31,

 
  

2020

  

2019

  

2018

 

Tax at federal statutory rate

  21.0%  21.0%  21.0%

State taxes, net of federal

  39.2%  36.6%  (1.2%)

Permanent items

  284.4%  312.2%  (2.4%)

Other

  5.6%  5.6%  (0.1%)

State rate change

  0.2%  (24%)  15.8%

Valuation allowance

  (352.5%)  (362.7%)  (34.5%)

Effective tax rate

  (2.1%)  (11.6%)  (1.5%)
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
  

Year Ended December 31,

 
  

2020

  

2019

  

2018

 
  (Dollars in thousands) 

Net operating loss

 $60,268  $49,626  $45,831 

Stock option expense

  6,454   5,063   1,155 

Property and equipment

  (11,941)  (10,372)  (9,688)

Other

  1,194   966   552 

Less: Valuation allowance

  (55,975)  (45,283)  (37,850)

Net deferred income tax assets

 $-  $-  $-