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Note 10 - Income Taxes - Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:    
Net operating loss carryforwards $ 3,550 $ 3,395
Research credit carryforwards 235 236
Accrued expenses 188
Stock-based compensation 420 148
Other 79 32
Total deferred tax assets 4,472 3,811
Valuation allowance (4,472) (3,811)
Net deferred tax asset $ 0 $ 0