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Note 1 - Summary of Significant Accounting Policies - Contract Assets and Liabilities (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Cost incurred | $ 3,960,199 | $ 2,066,982
Prepayments | (1,732,231) | (1,959,042)
Deferred Revenue | (876,286) | (98,781)
Allowance for doubtful accounts at the end of the period | 1,351,682 | 9,159
Contract Assets | 2,773,058 | 624,275
Contract Liabilities | (1,421,376) | (615,116)
| $ 1,351,682 | $ 9,159

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