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Note 5 - Advances on Contracts (Details Textual) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018
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Advances on Inventory Purchases | $ 530,114 | $ 648,783

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- Definition Carrying value of capitalized payments made in advance for inventory that is expected to be received within one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_AdvancesOnInventoryPurchases
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant