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Note 3 - Contracts in Progress - Costs, Estimated Earnings, and Billings on Uncompleted Contracts (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Costs incurred on contracts in progress | $ 24,913,254 | $ 22,079,680
Estimated earnings | 26,040,219 | 16,499,697
| 50,953,473 | 38,579,377
Billings to date | (50,132,200) | (30,648,666)
| 821,273 | (7,930,711)
Included in accompanying balance sheets |  |
Contract assets | 1,357,797 | 8,397,024
Contract liabilities | $ (536,524) | $ (466,313)

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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 No definition available. + Details
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