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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

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