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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, 2022 | Dec. 31, 2021
Cost incurred | $ 3,448,036 | $ 3,381,994
Unbilled project deliveries | 938,041 | 454,158
VAT | 676,610 | 542,255
Other receivables | 61,873 | 60,158
Prepayments | (2,675,339) | (2,947,736)
Deferred Revenue | (258,308) | (499,146)
Contract with Customer, Asset (Liability), Net | 2,190,913 | 991,682
Contract assets | 2,786,063 | 1,906,510
Contract liabilities | (595,150) | (914,828)
Contract with Customer, Asset (Liability), Net | $ 2,190,913 | $ 991,682

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