Note 4 - Loans Leases Receivable - Impaired Loans Leases (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Recorded investment with no specific allowance recorded	$ 7,937,613	$ 7,117,268	$ 4,637,593
Unpaid principal balance with no specific allowance recorded	10,705,985	7,202,484	4,880,273
Average recorded investment with no specific allowance recorded	6,209,493	6,354,341	7,510,986
Interest income recognized with no specific allowance recorded	279,670	216,413	74,587
Interest income recognized for cash payments received with no specific allowance recorded	279,670	216,413	74,587
Recorded investment with specific allowance recorded	12,264,945	11,236,897	15,434,506
Unpaid principal balance with specific allowance recorded	12,621,231	11,240,836	15,512,479
Related allowance	3,658,545	3,043,319	3,642,968
Average recorded investment with specific allowance recorded	5,460,056	10,512,445	5,870,942
Interest income recognized with specific allowance recorded	112,327		66,247
Interest income recognized for cash payments received with specific allowance recorded	112,327	218,621	66,247
Recorded investment	20,202,558	18,354,163	20,072,099
Unpaid principal balance	23,327,216	18,443,318	20,392,752
Average recorded investment	11,669,549	16,866,786	13,381,928
Interest income recognized	391,997	435,034	140,834
Interest income recognized for cash payments received	391,997	435,034	140,834
Commercial Portfolio Segment [Member]
Recorded investment with no specific allowance recorded	1,846,136	1,634,269	841,895
Unpaid principal balance with no specific allowance recorded	4,539,729	1,644,706	951,600
Average recorded investment with no specific allowance recorded	2,346,184	1,406,310	2,858,343
Interest income recognized with no specific allowance recorded	209,854	71,183	16,748
Interest income recognized for cash payments received with no specific allowance recorded	209,854	71,183	16,748
Recorded investment with specific allowance recorded	2,653,315	4,613,940	8,094,556
Unpaid principal balance with specific allowance recorded	2,653,315	4,617,879	8,098,395
Related allowance	972,647	715,627	1,771,537
Average recorded investment with specific allowance recorded	1,118,374	4,584,142	2,959,495
Interest income recognized with specific allowance recorded	43,052	203,221	17,742
Interest income recognized for cash payments received with specific allowance recorded	43,052	203,221	17,742
Recorded investment	4,499,451	6,248,209	8,936,451
Unpaid principal balance	7,193,044	6,262,585	9,049,995
Average recorded investment	3,464,558	5,990,452	5,817,838
Interest income recognized	252,906	274,404	34,490
Interest income recognized for cash payments received	252,906	274,404	34,490
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Recorded investment with no specific allowance recorded	106,470	289,261
Unpaid principal balance with no specific allowance recorded	106,470	289,261	93,774
Average recorded investment with no specific allowance recorded	106,892	79,317	312,242
Interest income recognized with no specific allowance recorded		11,902
Interest income recognized for cash payments received with no specific allowance recorded		11,902
Recorded investment with specific allowance recorded	304,043	151,962	322,148
Unpaid principal balance with specific allowance recorded	660,329	151,962	322,148
Related allowance	38,533	48,462	57,398
Average recorded investment with specific allowance recorded	176,874	221,260	385,269
Recorded investment	410,513	441,222	322,148
Unpaid principal balance	766,799	441,222	415,922
Average recorded investment	283,766	300,577	697,511
Interest income recognized		11,902
Interest income recognized for cash payments received		11,902
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Recorded investment with no specific allowance recorded	506,603
Unpaid principal balance with no specific allowance recorded	506,603
Average recorded investment with no specific allowance recorded	101,321
Recorded investment with specific allowance recorded	148,795	4,844,312	4,353,817
Unpaid principal balance with specific allowance recorded	148,795	4,844,312	4,353,819
Related allowance	33,095	1,379,235	577,611
Average recorded investment with specific allowance recorded	159,389	4,447,831	1,022,930
Recorded investment	655,398	4,844,312	4,353,817
Unpaid principal balance	655,398	4,844,312	4,353,819
Average recorded investment	260,710	4,447,831	1,022,930
Commercial Real Estate Portfolio Segment [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Recorded investment with no specific allowance recorded	1,804,125	1,171,565	1,196,549
Unpaid principal balance with no specific allowance recorded	1,804,125	1,171,565	1,196,549
Average recorded investment with no specific allowance recorded	540,298	1,176,738	1,322,654
Recorded investment with specific allowance recorded	7,576,712	72,163	239,600
Unpaid principal balance with specific allowance recorded	7,576,712	72,163	239,600
Related allowance	2,052,057	1,763	58,910
Average recorded investment with specific allowance recorded	3,054,716	44,667	47,920
Interest income recognized with specific allowance recorded	57,760
Interest income recognized for cash payments received with specific allowance recorded	57,760
Recorded investment	9,380,837	1,243,728	1,436,149
Unpaid principal balance	9,380,837	1,243,728	1,436,149
Average recorded investment	3,595,014	1,221,405	1,370,574
Interest income recognized	57,760
Interest income recognized for cash payments received	57,760
Finance Leases Portfolio Segment [Member]
Recorded investment with no specific allowance recorded	1,929,061	2,944,540	1,690,121
Unpaid principal balance with no specific allowance recorded	1,929,061	2,944,540	1,690,121
Average recorded investment with no specific allowance recorded	2,193,339	2,879,695	1,731,982
Interest income recognized with no specific allowance recorded	60,483	132,167	43,461
Interest income recognized for cash payments received with no specific allowance recorded	60,483	132,167	43,461
Recorded investment with specific allowance recorded	319,536	724,953	1,566,143
Unpaid principal balance with specific allowance recorded	319,536	724,953	1,566,143
Related allowance	194,008	504,469	848,919
Average recorded investment with specific allowance recorded	273,352	625,107	841,733
Interest income recognized with specific allowance recorded			36,303
Interest income recognized for cash payments received with specific allowance recorded			36,303
Recorded investment	2,248,597	3,669,492	3,256,264
Unpaid principal balance	2,248,597	3,669,492	3,256,264
Average recorded investment	2,466,691	3,504,802	2,573,715
Interest income recognized	60,483	132,167	79,764
Interest income recognized for cash payments received	60,483	132,167	79,764
Residential Portfolio Segment [Member]
Recorded investment with no specific allowance recorded	983,753	943,388	853,294
Unpaid principal balance with no specific allowance recorded	1,058,532	1,018,167	892,495
Average recorded investment with no specific allowance recorded	723,424	685,807	964,590
Interest income recognized with no specific allowance recorded	9,043	1,161	9,903
Interest income recognized for cash payments received with no specific allowance recorded	9,043	1,161	9,903
Recorded investment with specific allowance recorded	1,125,859	761,458	807,886
Unpaid principal balance with specific allowance recorded	1,125,859	761,458	882,018
Related allowance	257,014	355,167	289,112
Average recorded investment with specific allowance recorded	552,539	549,286	573,211
Interest income recognized with specific allowance recorded	11,515	14,990	11,675
Interest income recognized for cash payments received with specific allowance recorded	11,515	14,990	11,675
Recorded investment	2,109,612	1,704,846	1,661,180
Unpaid principal balance	2,184,391	1,779,625	1,774,513
Average recorded investment	1,275,963	1,235,093	1,537,801
Interest income recognized	20,558	16,151	21,578
Interest income recognized for cash payments received	20,558	16,151	21,578
Consumer Portfolio Segment [Member]
Recorded investment with no specific allowance recorded	761,465	134,245	55,734
Unpaid principal balance with no specific allowance recorded	761,465	134,245	55,734
Average recorded investment with no specific allowance recorded	198,035	126,474	321,175
Interest income recognized with no specific allowance recorded	290		4,475
Interest income recognized for cash payments received with no specific allowance recorded	290		4,475
Recorded investment with specific allowance recorded	136,685	68,109	50,356
Unpaid principal balance with specific allowance recorded	136,685	68,109	50,356
Related allowance	111,191	38,596	39,481
Average recorded investment with specific allowance recorded	124,812	40,152	40,384
Interest income recognized with specific allowance recorded		410	527
Interest income recognized for cash payments received with specific allowance recorded		410	527
Recorded investment	898,150	202,354	106,090
Unpaid principal balance	898,150	202,354	106,090
Average recorded investment	322,847	166,626	361,559
Interest income recognized	290	410	5,002
Interest income recognized for cash payments received	$ 290	$ 410	$ 5,002