Note 6 - Income Tax (Details) - Tax Effects of Temporary Differences (USD $)	Jun. 30, 2013	Dec. 31, 2012
Deferred tax liabilities:
Amortization	$ (12,900,315)	$ (10,129,938)
Depreciation	(10,450,258)	(11,685,694)
Amortized intangibles		(839,560)
Prepaid expense	(397,865)	(430,896)
Other	(14,431)	(14,977)
Total deferred tax liabilities	(23,762,869)	(23,101,065)
Deferred tax assets:
Federal net operating loss carryforwards	1,134,998	4,426,198
Amortized intangibles	966,773
Alternative minimum credits carryforwards	720,797	555,690
State net operating loss carryforwards	345,025	769,262
Restructuring expense	1,685,576	632,170
Deferred compensation	304,242	322,644
Advance payments	307,378	327,718
Bad debt	414,742	704,147
Other	218,904	381,327
	6,098,435	8,119,156
Less: Valuation allowance	(2,107,722)
Total net deferred tax assets	$ 3,990,713	$ 8,119,156