Note 19 - Subsequent Events (Details Textual) - USD ($)	1 Months Ended	3 Months Ended
	Apr. 30, 2021	Mar. 31, 2021	Mar. 31, 2020	Sep. 30, 2019	Mar. 05, 2019	Mar. 30, 2018	Sep. 28, 2017
Repayments of Lines of Credit		$ 26,320,000	$ 20,000,000
Revolving Credit Facility [Member] | Truist Bank [Member]
Line of Credit Facility, Maximum Borrowing Capacity				$ 20,000,000	$ 25,000,000	$ 60,000,000	$ 50,000,000
Revolving Credit Facility [Member] | Truist Bank [Member] | Third Amendment to Loan Agreement with BB and T [Member]
Line of Credit Facility, Maximum Borrowing Capacity							$ 20,000,000
Revolving Credit Facility [Member] | Truist Bank [Member] | Third Amendment to Loan Agreement with BB and T [Member] | Subsequent Event [Member]
Repayments of Lines of Credit	$ 18,700,000