Note 20 - Concentration of Risk - Company's Concentration of Customers and Suppliers (Details)		3 Months Ended			12 Months Ended
		Mar. 31, 2020		Mar. 31, 2019	Dec. 31, 2019
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Customer A [Member]
Concentration risk	[1]			17.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Customer B [Member]
Concentration risk	[1]
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Customer C [Member]
Concentration risk	[1]
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Customer D [Member]
Concentration risk	[1]
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Customer E [Member]
Concentration risk	[1]	15.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Customer F [Member]
Concentration risk	[1]	11.00%
Cost Of Sales Total [Member] | Supplier Concentration Risk [Member] | Supplier A [Member]
Concentration risk		71.00%			89.00%
Cost Of Sales Total [Member] | Supplier Concentration Risk [Member] | Supplier B [Member]
Concentration risk		11.00%	[1]
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer A [Member]
Concentration risk		27.00%			57.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer B [Member]
Concentration risk		12.00%	[1]		13.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer C [Member]
Concentration risk		24.00%	[1]		12.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer D [Member]
Concentration risk		11.00%	[1]
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer E [Member]
Concentration risk			[1]
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer F [Member]
Concentration risk			[1]

[1] Less than 10%.