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Note 3 - Costs and Estimated Earnings and Billings on Uncompleted Contracts (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Excess Billings Over Earnings [Table Text Block] |
|  | As of December 31,
|  | 2016 |  | 2015
Costs incurred and estimated earnings on uncompleted contracts |  | $ | 1,749,328 |  |  | $ | 1,741,070 |
Billings on uncompleted contracts |  |  | (1,780,723 | ) |  |  | (1,744,721 | )
Excess of billings over costs incurred and estimated earnings |  | $ | (31,395 | ) |  | $ | (3,651 | )
Schedule of Net Amount of Costs and Earnings on Uncompleted Contracts [Table Text Block] |
|  | As of December 31,
|  | 2016 |  | 2015
Costs and estimated earnings in excess of billings on uncompleted contracts |  | $ | 32,705 |  |  | $ | 26,905 |
Billings in excess of costs and estimated earnings on uncompleted contracts |  |  | (64,100 | ) |  |  | (30,556 | )
Net amount of costs and estimated earnings on uncompleted contracts below billings |  | $ | (31,395 | ) |  | $ | (3,651 | )

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