Note 23 - Subsequent Events - Acquisitions (Details) - USD ($)		12 Months Ended
	Feb. 12, 2019	Dec. 31, 2018	Dec. 31, 2017
Subsequent Event [Line Items]
Aggregate principal amount		$ 40,210,000	$ 40,210,000
Other borrowings		72,032,318	$ 66,000,000
London Interbank Offered Rate (LIBOR)
Subsequent Event [Line Items]
Variable interest rate (as a percent)	282.00%
Term Notes Member
Subsequent Event [Line Items]
Other borrowings		23,300,000
Revolving line of credit
Subsequent Event [Line Items]
Revolving line of credit		9,000,000
Other borrowings		$ 9,000,000
Revolving line of credit | London Interbank Offered Rate (LIBOR)
Subsequent Event [Line Items]
Variable interest rate (as a percent)		2.50%
Subsequent Event [Member]
Subsequent Event [Line Items]
Net proceeds	$ 63,500,000
Subsequent Event [Member] | Term Notes Member
Subsequent Event [Line Items]
Repayments of debt	21,400,000
Subsequent Event [Member] | Subordinated Notes Due February 15, 2029 [Member]
Subsequent Event [Line Items]
Aggregate principal amount	$ 65,000,000