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Note 1 - Significant Accounting Policies (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2017
Jul. 30, 2017
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Proceeds from Issuance of Long-term Debt $ 400,000 $ 650,000      
Shipping, Handling and Transportation Costs       $ 500,000 $ 200,000
Share-based Compensation       68,000 193,000
Unrestricted Cash and Cash Equivalents       1,950,000  
Surety Bonds Amount Outstanding       7,300,000  
Loss Contingency, Loss in Period       20,000 20,000
Goodwill       $ 1,907,000 $ 1,907,000
Customer Concentration Risk [Member] | Accounts Receivable [Member] | US-Based Retail Company [Member]          
Concentration Risk, Percentage         25.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | US-based IT OEM Company [Member]          
Concentration Risk, Percentage       26.00% 10.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | US-based UPS Manufacturer [Member]          
Concentration Risk, Percentage       22.00% 15.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | US-based Technology Company [Member]          
Concentration Risk, Percentage       23.00% 17.00%
Cost of Sales [Member]          
Share-based Compensation       $ 0 $ 7,000
Selling, General and Administrative Expenses [Member]          
Share-based Compensation       $ 100,000 200,000
Portion of Facilities Maintenance Segment [Member]          
Asset Purchase Agreement, Consideration Transferred     $ 350,000   $ 950,000