Note 3 - Accounts Receivable, Net (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]

	As of December 31, 2019			As of December 31, 2018
Accounts receivable	$	50,651,104		$	15,064,580
Less: allowance for doubtful accounts		(623,970	)		(658,104	)
Accounts receivable, net	$	50,027,134		$	14,406,476

Financing Receivable, Allowance for Credit Loss [Table Text Block]

	For the Years Ended
	December 31, 2019			December 31, 2018
Beginning balance	$	658,104		$	567,108
Provision for doubtful accounts		(4,515	)		119,329
Less: write off/recovery		(29,619	)		(28,333	)
Ending balance	$	623,970		$	658,104