Annual report pursuant to Section 13 and 15(d)

Note 10 - Income Taxes (Details Textual)

v3.6.0.2
Note 10 - Income Taxes (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 5,750,000 $ 4,822,000  
Deferred Tax Assets, Tax Credit Carryforwards, Research 518,000 248,000  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 0    
Unrecognized Tax Benefits 268,000 $ 128,000 $ 97,000
Domestic Tax Authority [Member]      
Operating Loss Carryforwards 45,468,000    
Deferred Tax Assets, Tax Credit Carryforwards, Research 440,000    
State and Local Jurisdiction [Member]      
Operating Loss Carryforwards 24,498,000    
Deferred Tax Assets, Tax Credit Carryforwards, Research $ 454,000