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Note 16 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Thousands	6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)	140,204	28,282
Gross Proceeds from Stock Options Exercised	$ 258,047	$ 45,172
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total (in shares)	185,043	156,115
Common Stock, Dividends, Per Share, Declared (in dollars per share)	$ 0	$ 0
Share Buyback Program [Member]
Stock Repurchase Program, Authorized Amount			$ 5,000,000	$ 4,000,000
Stock Repurchased and Retired During Period, Shares (in shares)	156,505	788,425
Stock Repurchased During Period, Value	$ 398,256	$ 2,171,022

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Amount of gross proceeds including cash proceeds and increase accounts receivable from exercise of stock options granted under share-based compensation arrangement.

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