Note 20 - Concentration of Risk - Company's Concentration of Customers and Suppliers (Details)	3 Months Ended				6 Months Ended				12 Months Ended
	Jun. 30, 2019		Jun. 30, 2018		Jun. 30, 2019		Jun. 30, 2018		Dec. 31, 2018
Cost Of Sales Total [Member] | Supplier Concentration Risk [Member] | Supplier A [Member]
Revenues, customer concentration risk	91.00%		87.00%		90.00%		83.00%
Cost Of Sales Total [Member] | Supplier Concentration Risk [Member] | Supplier B [Member]
Revenues, customer concentration risk		[1]	10.00%			[1]	13.00%
Customer A [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Revenues, customer concentration risk	11.00%		19.00%		13.00%		14.00%
Customer A [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Revenues, customer concentration risk					66.00%				74.00%
Customer C [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Revenues, customer concentration risk			11.00%			[1]		[1]
Customer C [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Revenues, customer concentration risk									12.00%
Customer B [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Revenues, customer concentration risk				[1]			14.00%

[1] Less than 10%.