Note 19 - Concentration of Risk - Company's Concentration of Customers and Suppliers (Details)	3 Months Ended			12 Months Ended
	Mar. 31, 2019		Mar. 31, 2018	Dec. 31, 2018
Cost Of Sales Total [Member] | Supplier Concentration Risk [Member] | Supplier A [Member]
Revenues, customer concentration risk	89.00%		73.00%
Cost Of Sales Total [Member] | Supplier Concentration Risk [Member] | Supplier B [Member]
Revenues, customer concentration risk		[1]	21.00%
Customer A [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Revenues, customer concentration risk	17.00%
Customer A [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Revenues, customer concentration risk	72.00%			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	11.00%			12.00%
Customer B [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Revenues, customer concentration risk			36.00%

[1] Less than 10%.