Note 3 - Loans Leases Receivable - Allowance for Estimated Losses on Loans Leases (Details) - USD ($)		3 Months Ended
		Mar. 31, 2017		Mar. 31, 2016	Mar. 31, 2017		Dec. 31, 2016
Balance		$ 30,757,448		$ 26,140,906
Provisions (credits) charged to expense		2,105,109		2,072,985
Loans/leases charged off		(892,626)		(868,284)
Recoveries on loans/leases previously charged off		89,219		49,835
Balance		32,059,150		27,395,442
Allowance for impaired loans/leases					$ 3,748,557		$ 3,642,968
Allowance for nonimpaired loans/leases					28,310,593		27,114,480
Less allowance for estimated losses on loans/leases		32,059,150		26,140,906	32,059,150		30,757,448
Impaired loans/leases					20,200,084		20,072,099
Nonimpaired loans/leases					2,407,685,155		2,377,342,183
Loans					$ 2,427,885,239		$ 2,397,414,282
Allowance as a percentage of impaired loans/leases					18.56%		18.15%
Allowance as a percentage of nonimpaired loans/leases					1.18%		1.14%
Total allowance as a percentage of total loans/leases					1.31%		1.28%
Commercial Portfolio Segment [Member]
Balance		12,545,110		10,484,080
Provisions (credits) charged to expense		593,359		739,831
Loans/leases charged off		(218,273)		(243,566)
Recoveries on loans/leases previously charged off		33,894		11,634
Balance		12,954,090		10,991,979
Allowance for impaired loans/leases					$ 1,751,774		$ 1,771,537
Allowance for nonimpaired loans/leases					11,202,316		10,773,573
Less allowance for estimated losses on loans/leases		12,545,110		10,484,080	12,954,090		12,545,110
Impaired loans/leases					9,188,454		8,936,451
Nonimpaired loans/leases					842,389,893		818,700,812
Loans					$ 851,578,347		$ 827,637,263
Allowance as a percentage of impaired loans/leases					19.06%		19.82%
Allowance as a percentage of nonimpaired loans/leases					1.33%		1.32%
Total allowance as a percentage of total loans/leases					1.52%		1.52%
Commercial Real Estate Portfolio Segment [Member]
Balance		11,670,609		9,375,117
Provisions (credits) charged to expense		966,271		715,450
Loans/leases charged off
Recoveries on loans/leases previously charged off		6,386
Balance		12,643,266		10,090,567
Allowance for impaired loans/leases					$ 888,445		$ 693,919
Allowance for nonimpaired loans/leases					11,754,821		10,976,690
Less allowance for estimated losses on loans/leases		11,670,609		9,375,117	12,643,266		11,670,609
Impaired loans/leases					5,924,061		6,112,114
Nonimpaired loans/leases					1,100,917,660		1,087,346,746
Loans					$ 1,106,841,721		$ 1,093,458,860
Allowance as a percentage of impaired loans/leases					15.00%		11.35%
Allowance as a percentage of nonimpaired loans/leases					1.07%		1.01%
Total allowance as a percentage of total loans/leases					1.14%		1.07%
Finance Leases Portfolio Segment [Member]
Balance		3,111,898	[1]	3,395,088
Provisions (credits) charged to expense		505,015		478,245
Loans/leases charged off		(658,684)		(600,938)
Recoveries on loans/leases previously charged off		20,031		14,836
Balance		2,978,260	[1]	3,287,231
Allowance for impaired loans/leases					$ 795,840		$ 848,919
Allowance for nonimpaired loans/leases					2,182,420		2,262,979
Less allowance for estimated losses on loans/leases		2,978,260	[1]	3,395,088	2,978,260	[1]	3,111,898	[1]
Impaired loans/leases					3,082,068		3,256,264
Nonimpaired loans/leases					156,286,357		162,163,096
Loans	[1],[2]				$ 159,368,425		$ 165,419,360
Allowance as a percentage of impaired loans/leases					25.82%		26.07%
Allowance as a percentage of nonimpaired loans/leases					1.40%		1.40%
Total allowance as a percentage of total loans/leases					1.87%		1.88%
Residential Portfolio Segment [Member]
Balance		2,342,344		1,790,150
Provisions (credits) charged to expense		43,520		62,656
Loans/leases charged off		(13,623)		(16,184)
Recoveries on loans/leases previously charged off		3,623
Balance		2,375,864		1,836,622
Allowance for impaired loans/leases					$ 274,566		$ 289,112
Allowance for nonimpaired loans/leases					2,101,298		2,053,232
Less allowance for estimated losses on loans/leases		2,342,344		1,790,150	2,375,864		2,342,344
Impaired loans/leases					1,780,774		1,661,180
Nonimpaired loans/leases					229,545,125		227,571,924
Loans	[2],[3]				$ 231,325,899		$ 229,233,104
Allowance as a percentage of impaired loans/leases					15.42%		17.40%
Allowance as a percentage of nonimpaired loans/leases					0.92%		0.90%
Total allowance as a percentage of total loans/leases					1.03%		1.02%
Consumer Portfolio Segment [Member]
Balance		1,087,487		1,096,471
Provisions (credits) charged to expense		(3,056)		76,803
Loans/leases charged off		(2,046)		(7,596)
Recoveries on loans/leases previously charged off		25,285		23,365
Balance		1,107,670		1,189,043
Allowance for impaired loans/leases					$ 37,932		$ 39,481
Allowance for nonimpaired loans/leases					1,069,738		1,048,006
Less allowance for estimated losses on loans/leases		$ 1,087,487		$ 1,096,471	1,107,670		1,087,487
Impaired loans/leases					224,727		106,090
Nonimpaired loans/leases					78,546,120		81,559,605
Loans	[2]				$ 78,770,847		$ 81,665,695
Allowance as a percentage of impaired loans/leases					16.88%		37.21%
Allowance as a percentage of nonimpaired loans/leases					1.36%		1.28%
Total allowance as a percentage of total loans/leases					1.41%		1.33%

[1] Management performs an evaluation of the estimated unguaranteed residual values of leased assets on an annual basis, at a minimum. The evaluation consists of discussions with reputable and current vendors, which is combined with management's expertise and understanding of the current states of particular industries to determine informal valuations of the equipment. As necessary and where available, management will utilize valuations by independent appraisers. The large majority of leases with residual values contain a lease options rider, which requires the lessee to pay the residual value directly, finance the payment of the residual value, or extend the lease term to pay the residual value. In these cases, the residual value is protected and the risk of loss is minimal. There were no losses related to residual values for the three months ended March 31, 2017 and 2016.

[2] Performing = loans/leases accruing and less than 90 days past due. Nonperforming = loans/leases on nonaccrual, accruing loans/leases that are greater than or equal to 90 days past due, and accruing TDRs.

[3] Includes residential real estate loans held for sale totaling $1,051,000 and $1,135,500 as of March 31, 2017, and December 31, 2016, respectively.