Note 1 - Basis of Presentation and Accounting Policies (Details) - Impact of Restated Adjustments - USD ($)		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income tax receivable	[1]		$ 1,591,105
Prepaid expenses and other assets		$ 8,348,385	7,467,178	[1]
Total assets		946,282,972	885,430,647
Retained earnings		43,691,073	40,868,919	[1]
Total stockholders' equity		82,170,774	80,002,576		$ 74,207,180
Income tax expense		1,837,329	1,349,009	[1]
Net income		$ 4,683,213	$ 4,089,622	[1]
Basic earnings per share (in Dollars per share)		$ 0.49	$ 0.43	[1]
Diluted earnings per share (in Dollars per share)		$ 0.49	$ 0.42	[1]
Scenario, Previously Reported [Member] | Income Tax Receivable [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income tax receivable			$ 2,594,376
Scenario, Previously Reported [Member] | Prepaid Expenses and Other Current Assets [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Prepaid expenses and other assets			6,898,192		9,599,143
Scenario, Previously Reported [Member] | Total Assets [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total assets			885,864,932		674,721,943
Scenario, Previously Reported [Member] | Retained Earnings [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Retained earnings			41,303,204		38,849,326
Scenario, Previously Reported [Member] | Total Stockholders' Equity [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total stockholders' equity			80,436,861		74,858,143
Scenario, Actual [Member] | Income Tax Receivable [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income tax receivable			1,591,105
Scenario, Actual [Member] | Prepaid Expenses and Other Current Assets [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Prepaid expenses and other assets			7,467,178		8,948,180
Scenario, Actual [Member] | Total Assets [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total assets			885,430,647		674,070,980
Scenario, Actual [Member] | Retained Earnings [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Retained earnings			40,868,919		38,198,363
Scenario, Actual [Member] | Total Stockholders' Equity [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total stockholders' equity			80,002,576		$ 74,207,180
Income Tax Expense [Member] | Scenario, Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income tax expense			1,565,687
Income Tax Expense [Member] | Scenario, Actual [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income tax expense			1,349,009
Net Income (Loss) [Member] | Scenario, Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income			3,872,944
Net Income (Loss) [Member] | Scenario, Actual [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income			$ 4,089,622
Basic Earnings Per Share [Member] | Scenario, Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Basic earnings per share (in Dollars per share)			$ 0.40
Basic Earnings Per Share [Member] | Scenario, Actual [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Basic earnings per share (in Dollars per share)			0.43
Diluted Earnings Per Share [Member] | Scenario, Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Diluted earnings per share (in Dollars per share)			0.40
Diluted Earnings Per Share [Member] | Scenario, Actual [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Diluted earnings per share (in Dollars per share)			$ 0.42

[1] revised for prior period restatement