Note 7 - Income Taxes (Details) - Provision for Income Taxes (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current provision:
Federal	$ 3,368,974us-gaap_CurrentFederalTaxExpenseBenefit	$ 2,982,023us-gaap_CurrentFederalTaxExpenseBenefit	$ 3,054,862us-gaap_CurrentFederalTaxExpenseBenefit
State	548,225	527,042	415,244
	3,917,199us-gaap_CurrentIncomeTaxExpenseBenefit	3,509,065us-gaap_CurrentIncomeTaxExpenseBenefit	3,470,106us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred provision (benefit):
Federal	210,343	399,032	(107,843)
State	(26,853)	46,945	(12,688)
	183,490us-gaap_DeferredIncomeTaxExpenseBenefit	445,977us-gaap_DeferredIncomeTaxExpenseBenefit	(120,531)us-gaap_DeferredIncomeTaxExpenseBenefit
	$ 4,100,689us-gaap_IncomeTaxExpenseBenefit	$ 3,955,042us-gaap_IncomeTaxExpenseBenefit	$ 3,349,575us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.