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Note 1 - Summary of Significant Accounting Policies - Contract Assets and Liabilities (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019
Cost incurred | $ 4,305,503 | $ 3,960,199
Unbilled project deliveries | 1,805,884 | 1,971,106
VAT | 397,949 | 862,368
Other receivables | 114,036 | 58,397
Prepayments | (2,330,373) | (1,732,231)
Deferred Revenue | (1,093,114) | (876,286)
Contract with Customer, Asset (Liability), Net | 3,199,885 | 4,243,553
Contract assets | 4,523,130 | 5,664,929
Contract liabilities | (1,323,245) | (1,421,376)
Contract with Customer, Asset (Liability), Net | $ 3,199,885 | $ 4,243,553

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