Annual report pursuant to Section 13 and 15(d)

Note 9 - Income Taxes (Details Textual)

v3.8.0.1
Note 9 - Income Taxes (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   34.00% 34.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability   $ 3,900,000  
Effective Income Tax Rate Reconciliation, Percent   1.10% 1.10%
General and Administrative Expense [Member]      
Income Tax Examination, Penalties and Interest Expense   $ 0 $ 27,000
Other Liabilities [Member]      
Liability for Uncertainty in Income Taxes, Noncurrent   0 $ 40,000
Domestic Tax Authority [Member]      
Operating Loss Carryforwards   $ 26,527,000  
Domestic Tax Authority [Member] | Latest Tax Year [Member]      
Open Tax Year   2014  
Foreign Tax Authority [Member]      
Operating Loss Carryforwards   $ 32,030,000  
State and Local Jurisdiction [Member] | Earliest Tax Year [Member]      
Open Tax Year   2013  
Scenario, Forecast [Member]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%