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Note 1 - Summary of Significant Accounting Policies - Contract Assets and Liabilities (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Cost incurred | $ 3,381,994 | $ 3,997,161
Unbilled project deliveries | 454,158 | 1,015,977
VAT | 542,255 | 446,608
Other receivables | 60,158 | 75,010
Prepayments | (2,947,736) | (3,112,118)
Deferred Revenue | (499,146) | (866,680)
Contract with Customer, Asset (Liability), Net | 991,682 | 1,555,958
Contract assets | 1,906,510 | 2,708,136
Contract liabilities | (914,828) | (1,152,178)
Contract with Customer, Asset (Liability), Net | $ 991,682 | $ 1,555,958

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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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130533-203044 + Details
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