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Note 5 - Sale of Business Component (Details Textual) - USD ($)
3 Months Ended
Jan. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Proceeds from Divestiture of Businesses   $ 314,000
Gain (Loss) on Disposition of Business   321,000
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    
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] | Customer Contracts and Intellectual Property [Member]      
Asset Purchase Agreement, Intangible Assets Disposed of, Book Value $ 0