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Note 4 - Receivables - Accounts and Other Receivable, Net (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Accounts receivable, gross $ 110,739 $ 420,226
Less allowance for doubtful accounts (1,975) (305,895)
Accounts and other receivables, net 108,764 114,331
Trade Accounts Receivable [Member]    
Accounts receivable, gross 52,615 64,387
Less allowance for doubtful accounts (2,000)  
Other Receivables [Member]    
Accounts receivable, gross $ 58,124 $ 355,839