Note 17 - Concentrations - Concentration Risk (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Concentration risk, percentage	38.00%	55.00%	0.00%	37.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer One [Member]
Concentration risk, percentage	14.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer Four [Member]
Concentration risk, percentage		20.00%		20.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer Two [Member]
Concentration risk, percentage	14.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer Five [Member]
Concentration risk, percentage		14.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer Six [Member]
Concentration risk, percentage		11.00%		17.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer Three [Member]
Concentration risk, percentage	10.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer Seven [Member]
Concentration risk, percentage		10.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Concentration risk, percentage			57.00%		50.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Four [Member]
Concentration risk, percentage					12.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Eight [Member]
Concentration risk, percentage			27.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Eleven [Member]
Concentration risk, percentage					24.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Six [Member]
Concentration risk, percentage					14.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Nine [Member]
Concentration risk, percentage			15.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Ten [Member]
Concentration risk, percentage			15.00%
Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Concentration risk, percentage	25.00%	67.00%	31.00%	65.00%
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | UNITED KINGDOM
Concentration risk, percentage	25.00%	67.00%	31.00%	65.00%
Geographic Concentration Risk [Member] | Accounts Receivable [Member]
Concentration risk, percentage			21.00%		49.00%
Geographic Concentration Risk [Member] | Accounts Receivable [Member] | UNITED KINGDOM
Concentration risk, percentage			21.00%		49.00%