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Note 5 - Sale of Business Component (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Jan. 31, 2017
Sep. 28, 2016
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Proceeds from Divestiture of Businesses       $ 314,000 $ 792,000
Gain (Loss) on Disposition of Business       $ 321,000 910,000
Tech Site Services LLC [Member]          
Asset Purchase Agreement, Consideration Transferred $ 350,000        
Asset Purchase Agreement, Earnout Payment, Fee for Revenues Exceeding Measurement Period Revenue Threshold, Percentage 10.00%        
Asset Purchase Agreement, Earnout Payment, Measurement Period Revenue Threshold $ 2,500,000        
Asset Purchase Agreement, Earnout Payment, Measurement Period 1 year        
Asset Purchase Agreement, Earnout Payment, Period of Potential Payment 2 years        
Payments for Rent         253,000
Asset Purchase Agreement, Liabilities Assumed $ 7,000        
Proceeds from Divestiture of Businesses 343,000        
Asset Purchase Agreement, Transaction Costs 29,000        
Gain (Loss) on Disposition of Business     $ 321,000    
Tech Site Services LLC [Member] | Maryland-based Facilities Maintenance Business [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]          
Asset Purchase Agreement, Consideration Transferred   $ 950,000      
Asset Purchase Agreement, Liabilities Assumed   308,000      
Asset Purchase Agreement, Transaction Costs   40,000      
Gain (Loss) on Disposition of Business         $ 910,000
Disposal Group, Including Discontinued Operation, Consideration   642,000      
Tech Site Services LLC [Member] | Customer Contracts and Intellectual Property [Member]          
Asset Purchase Agreement, Intangible Assets Disposed of, Book Value $ 0        
Tech Site Services LLC [Member] | Customer Contracts and Intellectual Property [Member] | Maryland-based Facilities Maintenance Business [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]          
Asset Purchase Agreement, Intangible Assets Disposed of, Book Value   $ 0