Note 13 - Subsequent Event (Details Textual) - USD ($) $ in Millions			1 Months Ended
	Apr. 10, 2020	Apr. 01, 2020	Apr. 30, 2020	Sep. 30, 2019
Second Export Credit Agreement [Member]
Proceeds from Lines of Credit, Total				$ 30.5
Subsequent Event [Member]
Proceeds from U.S. Small Business Administration Loan	$ 6.6		$ 6.6
Subsequent Event [Member] | Second Export Credit Agreement [Member]
Proceeds from Lines of Credit, Total		$ 30.6