Note 19 - Parent Company-only Financial Statements - Condensed Statements of Cash Flows (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net income	$ 4,147,000	$ 1,930,000	$ 2,143,000
Share-based compensation	146,000	161,000	461,000
Amortization of debt issuance costs	82,000	9,000	7,000
(Increase) decrease in other assets	(2,000)	(657,000)	18,000
Increase (decrease) in accrued expenses and other liabilities	278,000	(1,325,000)	225,000
Net cash (used in) provided by operating activities	7,290,000	4,525,000	5,673,000
Net cash used in investing activities	(140,338,000)	(99,110,000)	(9,484,000)
Proceeds from issuance of senior notes, net		11,708,000
Purchases of treasury stock	(2,000)	(1,017,000)
Dividends paid on common stock	(77,000)
Net cash (used in) provided by financing activities	90,000,000	101,474,000	15,953,000
Net (decrease) increase in cash and cash equivalents	(43,048,000)	6,889,000	12,142,000
Cash and cash equivalents at beginning of period	92,289,000	85,400,000	73,258,000
Cash and cash equivalents at end of period	49,241,000	92,289,000	85,400,000
Cash paid for interest	6,424,000	3,413,000	2,325,000
Cash paid for income taxes	515,000	360,000	3,000
Increase in debt issuance costs		82,000
Accounts payable		(82,000)
Parent Company [Member]
Net income	4,147,000	1,930,000	2,143,000
Equity in undistributed income of subsidiary	(5,641,000)	(2,464,000)	(2,965,000)
Dividends received from Patriot Bank, N.A.		890,000
Share-based compensation	146,000	161,000	461,000
Amortization of debt issuance costs	82,000	9,000	7,000
(Increase) decrease in other assets	(13,000)		2,000
Increase (decrease) in accrued expenses and other liabilities	32,000	(414,000)	(3,000)
Net cash (used in) provided by operating activities	(1,247,000)	112,000	(355,000)
Net increase in investment in Patriot Bank N.A.		(7,198,000)
Net cash used in investing activities		(7,198,000)
Proceeds from issuance of senior notes, net		11,708,000
Purchases of treasury stock	(2,000)	(1,017,000)
Dividends paid on common stock	(77,000)
Net cash (used in) provided by financing activities	(79,000)	10,691,000
Net (decrease) increase in cash and cash equivalents	(1,326,000)	3,605,000	(355,000)
Cash and cash equivalents at beginning of period	3,645,000	40,000	395,000
Cash and cash equivalents at end of period	2,319,000	3,645,000	40,000
Cash paid for interest	1,203,000	777,000
Cash paid for income taxes
Increase in debt issuance costs		82,000
Accounts payable		$ (82,000)