Note 8 - Borrowed Funds - Long-term Borrowing Maturities (Details) (Parentheticals)	Sep. 30, 2018	Dec. 31, 2017
Federal Home Loan Bank Borrowings Loan Maturing in 2019 with Rate of 1.95% [Member]
Rate	1.95%
Federal Home Loan Bank of Pittsburgh [Member] | Federal Home Loan Bank Borrowings Loan Maturing in 2018 with Rate of 1.63% [Member]
Rate	1.63%	1.63%
Federal Home Loan Bank of Pittsburgh [Member] | Federal Home Loan Bank Borrowings Loan Maturing in 2018 with Rate of 1.35% [Member]
Rate	1.35%	1.35%
Federal Home Loan Bank of Pittsburgh [Member] | Federal Home Loan Bank Borrowings Loan Maturing in 2019 with Rate of 1.83% [Member]
Rate	1.83%	1.83%
Federal Home Loan Bank of Pittsburgh [Member] | Federal Home Loan Bank Borrowings Loan Maturing in 2019 with Rate of 2.15% [Member]
Rate	2.15%
Federal Home Loan Bank of Pittsburgh [Member] | Federal Home Loan Bank Borrowings Loan Maturing in 2019 with Rate of 2.24% [Member]
Rate	2.24%
Federal Home Loan Bank of Pittsburgh [Member] | Federal Home Loan Bank Borrowings Loan Maturing in 2019 with Rate of 2.3% [Member]
Rate	2.30%
Federal Home Loan Bank of Pittsburgh [Member] | Federal Home Loan Bank Borrowings Loan Maturing in 2019 with Rate of 2.42% [Member]
Rate	2.42%
Federal Home Loan Bank of Pittsburgh [Member] | Federal Home Loan Bank Borrowings Loan Maturing in 2019 with Rate of 2.41% [Member]
Rate	2.41%
Federal Home Loan Bank of Pittsburgh [Member] | Federal Home Loan Bank Borrowings Loan Maturing in 2019 with Rate of 2.48% [Member]
Rate	2.48%	2.48%
Federal Home Loan Bank of Pittsburgh [Member] | Federal Home Loan Bank Borrowings Loan Maturing in 2019 with Rate of 2.53% [Member]
Rate	2.53%	2.53%
Federal Home Loan Bank of Pittsburgh [Member] | Federal Home Loan Bank Borrowings Loan Maturing in 2020 with Rate of 4.79% [Member]
Rate	4.79%	4.79%
Federal Home Loan Bank of Pittsburgh [Member] | Federal Home Loan Bank Borrowings Loan Maturing in 2025 with Rate of 4.91% [Member]
Rate	4.91%	4.91%