Note 21 - Concentration of Risk - Company's Concentration of Customers and Suppliers (Details)		3 Months Ended			9 Months Ended			12 Months Ended
		Sep. 30, 2019		Sep. 30, 2018	Sep. 30, 2019		Sep. 30, 2018	Dec. 31, 2018
Cost Of Sales Total [Member] | Supplier Concentration Risk [Member] | Supplier A [Member]
Revenues, customer concentration risk		88.00%		86.00%	90.00%		84.00%
Cost Of Sales Total [Member] | Supplier Concentration Risk [Member] | Supplier B [Member]
Revenues, customer concentration risk			[1]	10.00%		[1]	12.00%
Customer A [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Revenues, customer concentration risk				22.00%	11.00%		17.00%
Customer A [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Revenues, customer concentration risk					68.00%			74.00%
Customer C [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Revenues, customer concentration risk	[1]
Customer C [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Revenues, customer concentration risk						[1]		12.00%
Customer D [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Revenues, customer concentration risk	[1]
Customer B [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Revenues, customer concentration risk	[1]

[1] Less than 10%.