Note 11 - Subordinated Debentures and Other Borrowings - Subordinated Notes (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($)
Trust Preferred Securities [Member]
Long term debt	$ 26,045
Trust Preferred Securities [Member] | Commonwealth Statutory Trust III [Member]
Long term debt	3,005
Trust Preferred Securities [Member] | Commonwealth Statutory Trust IV [Member]
Long term debt	12,021
Trust Preferred Securities [Member] | Commonwealth Statutory Trust V [Member]
Long term debt	11,019
Subordinated Debt [Member]
Long term debt	26,000
Subordinated Debt [Member] | Commonwealth Statutory Trust III [Member]
Long term debt	$ 3,000
Subordinated Debt [Member] | Commonwealth Statutory Trust III [Member] | London Interbank Offered Rate (LIBOR) [Member]
Index	2.85%
Subordinated Debt [Member] | Commonwealth Statutory Trust IV [Member]
Long term debt	$ 12,000
Subordinated Debt [Member] | Commonwealth Statutory Trust IV [Member] | London Interbank Offered Rate (LIBOR) [Member]
Index	1.35%
Subordinated Debt [Member] | Commonwealth Statutory Trust V [Member]
Long term debt	$ 11,000
Subordinated Debt [Member] | Commonwealth Statutory Trust V [Member] | London Interbank Offered Rate (LIBOR) [Member]
Index	1.40%