Note 23 - Parent Company Condensed Financial Information - Condensed Statements of Cash Flows (Details) - USD ($)	1 Months Ended	3 Months Ended								12 Months Ended
	Jul. 31, 2016	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net income		$ 1,744,000	$ 1,761,000	$ 1,787,000	$ 1,585,000	$ 1,109,000	$ 1,401,000	$ 1,232,000	$ 1,469,000	$ 6,877,000	$ 5,211,000
Adjustments to reconcile net income to net cash and cash equivalents provided by operating activities:
Stock compensation expense										82,000	71,000
Net cash provided by operating activities										8,240,000	6,006,000
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from sale of cost method equity investment	$ 856,000									856,000
Net cash provided by (used in) investing activities										(96,201,000)	56,927,000
CASH FLOWS FROM FINANCING ACTIVITIES
Advances on line of credit											500,000
Repayment of advances on line of credit											(500,000)
Purchase of treasury stock										(34,000)	(10,000)
Dividends paid										(2,817,000)	(2,449,000)
Net cash used in financing activities										24,622,000	12,998,000
Net increase in cash and cash equivalents										(63,339,000)	75,931,000
Parent Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income										6,864,000	5,198,000
Adjustments to reconcile net income to net cash and cash equivalents provided by operating activities:
Equity in undistributed net income of subsidiaries										(4,538,000)	12,074,000
Stock compensation expense										82,000	71,000
Gain on sale of cost method equity investment										(145,000)	0
Net change in other assets and liabilities										(15,000)	3,000
Net cash provided by operating activities										2,248,000	17,346,000
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from sale of cost method equity investment										856,000	0
Net cash paid in acquisition of Peoples										0	(14,748,000)
Net cash provided by (used in) investing activities										856,000	(14,748,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Advances on line of credit										0	500,000
Repayment of advances on line of credit										0	(500,000)
Purchase of treasury stock										(34,000)	(10,000)
Dividends paid										(2,804,000)	(2,436,000)
Net cash used in financing activities										(2,838,000)	(2,446,000)
Net increase in cash and cash equivalents										266,000	152,000
Cash and cash equivalents at beginning of year					$ 461,000				$ 309,000	461,000	309,000
Cash and cash equivalents at end of year		$ 727,000				$ 461,000				$ 727,000	$ 461,000