Note 21 - Major Customers and Accounts Receivable (Details Textual) - Customer Concentration Risk [Member]	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Revenue Benchmark [Member]
Concentration Risk, Number of Major Customers	1	1	1	3
Revenue Benchmark [Member] | Customer A [Member]
Concentration Risk, Percentage	13.00%		21.00%
Revenue Benchmark [Member] | Customer B [Member]
Concentration Risk, Percentage		28.00%
Revenue Benchmark [Member] | Customer A, B, and C [Member]
Concentration Risk, Percentage				50.00%
Current Accounts Receivable [Member]
Concentration Risk, Number of Major Customers			2
Current Accounts Receivable [Member] | Customer A [Member]
Concentration Risk, Percentage					18.00%
Current Accounts Receivable [Member] | Customer B [Member]
Concentration Risk, Percentage					16.00%
Current Accounts Receivable [Member] | Two Customers [Member]
Concentration Risk, Percentage			26.00%
Current Accounts Receivable [Member] | Customer C [Member]
Concentration Risk, Percentage					14.00%
Accounts Receivable [Member]
Concentration Risk, Number of Major Customers					3