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Note 3 - Contracts in Progress - Costs, Estimated Earnings, and Billings on Uncompleted Contracts (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Costs incurred on contracts in progress	$ 4,678,192	$ 7,695,281
Estimated earnings	10,733,826	7,635,114
Total	15,412,018	15,330,395
Billings to date	(18,077,839)	(10,695,377)
Cost in excess of billing, net	(2,665,821)	4,635,018
Included in accompanying balance sheets
Costs and estimated earnings in excess of billings on contracts in progress	2,596,518	4,635,018
Billings in excess of costs and estimated earnings on contracts in progress	$ (5,262,339)	$ 0

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- Definition

Amount billed to customers on uncompleted contracts.

+ References

No definition available.

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- Definition

Amount of revenue recognized on uncompleted contracts as a result of the actual costs incurred compared to estimated total costs.

+ References

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- Definition

Those actual material, labor and overhead costs incurred on all uncompleted contracts.

+ References

No definition available.

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- Definition

Estimated earnings on the amount of revenue recognized as a result of the actual costs incurred compared to the estimated total costs of the contract.

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Recognition of additional revenue in excess of that billed as a result of actual costs incurred.

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Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method that are expected to be realized within one year or one operating cycle, whichever is longer, from the reporting date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 35
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=68068069&loc=d3e57788-111642

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Amount of receivable reflecting the cost incurred on uncompleted contracts in excess of related billings which is expected to be collected within one year or the normal operating cycle, if longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 35
-Section 45
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-URI http://asc.fasb.org/extlink&oid=68068069&loc=d3e57795-111642

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