Income Taxes Deferred Taxes (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Deferred Tax Assets:
Allowance for receivables	$ 34,820	$ 52,439
Deferred revenue	352,087	383,920
Share-based compensation	23,647	25,127
Accrued expenses and other liabilities	331,497	232,777
Domestic net operating loss carryforwards	20,072,283	20,761,781
Foreign net operating loss carryforwards	187,114	187,328
Tax credit carryforwards	3,106,022	3,106,022
AMT tax credit carryforwards	0	116,504
Capital loss carryforwards	34,254	32,109
Fixed assets	155,942	179,534
Interest expense carryforwards	0	94,674
Deferred Tax Assets Lease Liability	134,522	494,030
Intangibles	113,932	176,210
Sub-total	24,546,120	25,842,455
Valuation allowance	(23,222,032)	(23,613,642)
Total Deferred Tax Assets	1,324,088	2,228,813
Deferred Tax Liabilities:
Prepaid commissions and other	(113,706)	(134,618)
Tax method changes	(429,836)	(913,496)
Deferred Tax Liabilities, Leasing Arrangements	(105,116)	(387,740)
Deferred state income tax	(408,089)	(470,545)
Foreign withholding taxes	(449,816)	(496,093)
Total Deferred Tax Liabilities	(1,506,563)	(2,402,492)
Deferred Tax Liabilities, Net	$ (182,475)	$ (173,679)