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Note 5 - Sale of Business Component - Pre-tax Profit (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Pre-tax profit $ 775 $ (1,004)
Maryland-based Facilities Maintenance Business [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]    
Pre-tax profit 812
Specific Customer Contract from Project Management Business [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]    
Pre-tax profit $ 93 $ 478