Note 14 - Intellectual Property - License Agreements (Details Textual)	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Number of License Agreements	3
Royalty Expense	$ 1,100,000	$ 2,800,000	$ 5,200,000
Cost of Goods and Services Sold, Total	$ 16,826,000	$ 18,470,000	$ 16,491,000
Aggregate Royalty Rate, Percent of Gross Product and Service Revenue	2.00%	5.00%	11.00%
License [Member]
Cost of Goods and Services Sold, Total	$ 83,000	$ 80,000	$ 161,000