Note 12 - Stock-based Compensation (Details) - A Summary of Option Activity Under the Plan - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Note 12 - Stock-based Compensation (Details) - A Summary of Option Activity Under the Plan [Line Items]
Outstanding, Price (in Dollars per share)	$ 11.38	$ 11.84
Outstanding, Aggregate Instrinsic Value (in Dollars)	$ 194,020	$ 185,900
Options Granted, Shares Available	14,000	19,000
Options Granted, Options Outstanding	14,000	19,000
Options Granted, Price (in Dollars per share)	$ 8.01	$ 8.34
Restricted stock awards (in Dollars per share)		8.36
Forfeited, Price (in Dollars per share)	7.15	6.78
Expired, Price (in Dollars per share)	19.54	16.42
Exercised, Price (in Dollars per share)	0.00	0.00
Outstanding, Price (in Dollars per share)	$ 10.76	$ 11.38
Outstanding, Aggregate Instrinsic Value (in Dollars)	$ 234,380	$ 194,020
Shares Available [Member]
Note 12 - Stock-based Compensation (Details) - A Summary of Option Activity Under the Plan [Line Items]
Outstanding	812,850	842,250
Options Granted, Shares Available	(14,000)	(19,000)
Options Granted, Options Outstanding	(14,000)	(19,000)
Restricted stock awards		(13,900)
Forfeited, Shares Available	7,250	3,500
Forfeited, Options Outstanding	(7,250)	(3,500)
Outstanding	806,100	812,850
Options Outstanding [Member]
Note 12 - Stock-based Compensation (Details) - A Summary of Option Activity Under the Plan [Line Items]
Outstanding	169,500	160,375
Options Granted, Shares Available	14,000	19,000
Options Granted, Options Outstanding	14,000	19,000
Forfeited, Shares Available	7,250	3,500
Forfeited, Options Outstanding	(7,250)	(3,500)
Expired, Options Outstanding	(10,500)	(6,375)
Outstanding	165,750	169,500