Note 3 - Major Customers and Suppliers (Details Textual)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Number of Major Customers	3	3
Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Number of Major Customers	5	4
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Five Major Customers [Member]
Concentration Risk, Percentage	77.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Four Major Customer [Member]
Concentration Risk, Percentage		70.00%
Revenue Benchmark [Member] | Product Concentration Risk [Member] | Biopharmaceuticals [Member]
Concentration Risk, Percentage	1.00%
Revenue Benchmark [Member] | Product Concentration Risk [Member] | Basic Natural and Chemically Modified Cyclodexterins [Member]
Concentration Risk, Percentage	96.00%	9.00%
Revenue Benchmark [Member] | Product Concentration Risk [Member] | Cyclodexterin Complexes [Member]
Concentration Risk, Percentage	3.00%	91.00%