Note 4 - Stock-based Compensation - Unrecognized Compensation Expense for Non-vested Restricted Stock Awards (Details) (Details) - Restricted Stock [Member]	Sep. 30, 2016 USD ($)
Award 2016 [Member]
2016	$ 15,032
2017	60,128
2018	60,128
2019	60,128
2020	10,021
	205,437
2015 [Member]
2016	14,126
2017	56,502
2018	56,502
2019	7,063
2020
	134,193
2014 [Member]
2016	14,127
2017	56,506
2018	7,063
2019
2020
	77,696
2016	43,285
2017	173,136
2018	123,693
2019	67,191
2020	10,021
	$ 417,326