Note 19 - Parent Company Financial Information - Condensed Statements of Cash Flows (Details) - USD ($)	3 Months Ended								12 Months Ended
	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	Dec. 31, 2014
Net income	$ 1,994,000	$ 1,894,000	$ 1,612,000	$ 1,461,000	$ 1,568,000	$ 1,237,000	$ 1,154,000	$ 725,000	$ 6,961,262	$ 4,683,213	$ 4,089,622	[1],[2],[3]
Stock based compensation expense									81,889	68,705	59,798
Net cash provided by (used in) operating activities									11,357,987	9,037,176	8,855,219
Net cash provided by (used in) investing activities									(41,359,971)	(85,341,306)	(5,086,991)
Retirement of common shares									0	(909,172)	(457,074)
Vesting of restricted stock awards, net									0	(954)	0
Net cash used in financing activities									38,186,396	58,178,721	28,113,134
Net increase (decrease) in cash									8,184,412	(18,125,409)	31,881,362
Cash and cash equivalents, beginning of year				37,991,268				56,116,677	37,991,268	56,116,677	24,235,315
Cash and cash equivalents, end of year	46,175,680				37,991,268				46,175,680	37,991,268	56,116,677
Parent Company [Member]
Net income									6,961,262	4,683,213	4,089,622
Stock based compensation expense									81,889	68,705	59,798
Equity in undistributed earnings of subsidiary									(7,448,666)	(5,099,001)	(4,347,843)
Upstream dividend received from subsidiary									1,918,000	2,129,000	1,690,000
Other operating activities									(170,651)	(128,775)	(57,839)
Net cash provided by (used in) operating activities									1,341,834	1,653,142	1,433,738
Purchase held-to-maturity investment									0	0	0
Sale of income tax receivable to subsidiary									0	0	0
Net cash provided by (used in) investing activities									0	0	0
Retirement of common shares									(42)	(909,172)	(457,074)
Vesting of restricted stock awards, net									42	(954)
Additional equity investment in subsidiary									0	0	0
Cash paid for dividends									(1,091,740)	(953,010)	(962,551)
Net cash used in financing activities									(1,091,740)	(1,863,136)	(1,419,625)
Net increase (decrease) in cash									250,094	(209,994)	14,113
Cash and cash equivalents, beginning of year				$ 20,942				$ 230,936	20,942	230,936	216,823
Cash and cash equivalents, end of year	$ 271,036				$ 20,942				$ 271,036	$ 20,942	$ 230,936

[1] revised for prior period restatement

[2] revised for prior period restatement

[3] revised for prior period restatement