Note 19 - Major Customers and Accounts Receivable (Details Textual) - Customer Concentration Risk [Member]	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Revenue Benchmark [Member]
Concentration Risk, Number of Major Customers	2	1	2	3
Revenue Benchmark [Member] | Two Customers [Member]
Concentration Risk, Percentage	36.00%
Revenue Benchmark [Member] | One Customer [Member]
Concentration Risk, Percentage		41.00%	34.00%
Revenue Benchmark [Member] | Three Customers [Member]
Concentration Risk, Percentage				60.00%
Current Accounts Receivable [Member]
Concentration Risk, Number of Major Customers			2		1
Current Accounts Receivable [Member] | Two Customers [Member]
Concentration Risk, Percentage			19.00%
Current Accounts Receivable [Member] | One Customer [Member]
Concentration Risk, Percentage			47.00%		31.00%