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Note 11 - Purchase of Interests in Subsidiaries (Details Textual) - USD ($) |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jan. 09, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Payments to Acquire Businesses, Net of Cash Acquired, Total |  |  |  | $ (767,000) |
Revenue from Contract with Customer, Including Assessed Tax |  | $ 58,388,000 | $ 48,752,000 | 172,191,000 | 131,361,000
Net Income (Loss) Attributable to Parent, Total |  | $ 621,000 | $ 246,000 | (1,018,000) | $ 346,000
Resource Plus, Inc [Member] |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  | 19,900,000 |
Net Income (Loss) Attributable to Parent, Total |  |  |  | $ 1,700,000 |
Resource Plus, Inc [Member] | BDA [Member] |  |  |  |  |
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest | 70.00% |  |  |  |
Resource Plus, Inc [Member] |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 51.00% |  |  |  |
Business Combination, Consideration Transferred, Total | $ 2,756,000 |  |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred | 2,300,000 |  |  |  |
Resource Plus, Inc [Member] | Mr. Paulk [Member] |  |  |  |  |
Business Combination, Consideration Transferred, Total | 3,000,000 |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired, Total | 400,000 |  |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred | 2,600,000 |  |  |  |
Debt Instrument, Periodic Payment, Principal | 300,000 |  |  |  |
Resource Plus, Inc [Member] | Mr. Justus [Member] |  |  |  |  |
Business Combination, Consideration Transferred, Total | 150,000 |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired, Total | 50,000 |  |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred | 100,000 |  |  |  |
Debt Instrument, Periodic Payment, Principal | 33,333 |  |  |  |
Employment Agreement, Base Salary | $ 200,000 |  |  |  |
Mobex [Member] |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 51.00% |  |  |  |

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