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Note 6 - Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Accrued expenses $ 65 $ 69
Net operating loss carryover 8,792 13,387
Goodwill and other intangibles 1,665 3,254
Deferred compensation 135 247
Depreciation 39 55
Other carryovers and credits 12 10
Total deferred tax assets 10,708 17,022
Deferred tax liabilities:    
Prepaid expenses (20) (38)
Depreciation
Total deferred tax liabilities (20) (38)
Valuation allowance (10,688) (16,984)
Net deferred tax asset (liability)