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Note 2 - Summary of Significant Accounting Policies - Impact on Previously Reported Results (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Costs and estimated earnings in excess of billings |  |
Contract assets | $ 1,357,797 | 8,397,024
Billings in excess of costs and estimated earnings |  |
Contract liabilities | $ 536,524 | 466,313
Previously Reported [Member] |  |
Costs and estimated earnings in excess of billings |  | 8,397,000
Contract assets |  |
Billings in excess of costs and estimated earnings |  | 466,000
Contract liabilities |  |
Restatement Adjustment [Member] | Accounting Standards Update 2014-09 [Member] |  |
Costs and estimated earnings in excess of billings |  | (8,397,000)
Contract assets |  | 8,397,000
Billings in excess of costs and estimated earnings |  | (466,000)
Contract liabilities |  | $ 466,000

X
- Definition Represents the 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 No definition available. + Details
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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130533-203044 + Details
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